Multiplying fractions with Varibles?
someone please help
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the LCD of 3 and 2 is 6
6(20-x/3)=(x/2)6 multiply both sides of the equation by the
LCD which is 6
120 – 2x = 3x
6*20 = 120
6*-x/3 = -2x (it’s simply 6/3 with the variable x)
6*x/2 = 3x (again simply 6/2 with x)
when multiplying fractions with variables multiply both sides of the equation by the LCD to cancel the denominators (or to change the fractions).
simplifying the equation, we get: 5x = 120 then x = 24
your question is 20- x/3 = x/2
so you put all the variables on one side and the whole number on the other(remember to change them to either -ve if itz +ve and vice versa)= -x/2 – x/3 = -20
now find the lowest common denominator which is 6
= -3x/6 – 2x/6 = -20 now cancel the 6 from each and work out the variables section first
= -3x – 2x = -20
= -5x = -20 now divide -20 by -5
x= 4
so the answer is positive 4. Hope that helps!
we can make x/3 and x/2 as 1/3x and 1/2x respectively so we can solve the equation easier.
so, we have our new equation: 20 – 1/3x = 1/2x
we need to combine the like terms, so transpose the -1/3x to the other side of the equation. Remember that when you move a term to the other side of the equation, you need to reverse its sign, so it will then become positive.
20 = 1/2x + 1/3x
Now, add the both fractions in the right side. To add them, make them similar fractions. Their LCD is 6, so divide 6 by their denominator then multiply by their numerator.
20 = 3/6x + 2/6x
We can now add them. Three plus two is five, then copy the denominator, and the variable.
20 = 5/6x
to remove the denominator, we need to multiply 6 to both sides so we can solve the equation easily.
(6) 20 = 5/6x (6)
it will then become…
120 = 5x
now, to eliminate the numerical coefficient of x, divide both sides by 5.
120/5 = 5x/5
it will result to:
24 = x
so, x is equal to 24.
that is your final answer. 🙂
first start by multiplying both sides by 6 (the least common multiple of 3 and 2)
6*(20-x/3)=6*x/2
120-(6*x)/3=(6*x)/2
120-2*x=3*x
now add 2*x to both sides:
120=5*x
divide by 5:
x=120/5=24
x=24
-x/3 – x/2 = -20
now taking LCM which is 6
-2x/6 – 3x/6 = -20
-5x/6 = -20
thus x = 24
OR 20=5X/6
OR X=20*6/5=24
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