One – 5x – 20 – 7, 5x-27 is the answer

Two – 54 + 9y +3y, 54 + 12y is the answer

Three – 42 + 12a – 8a, 42 + 4a is the answer

Four – 7r = 21, r = 21/7, r = 3

Five – 24t = 54, t = 54/24, t = 9/4 or t = 2-1/4

Six – 14x = 42, x = 42/14, x=6/2 or x = 3

5x-27

Then with the last three combine the like terms then devide by the number left with the variable.

ex4: 5r+2r=21 would be 7r=21. Devide both sides by 7 and you get r(which is the same as 1r) =3

get it?

5x=-11

x= 11/5

= 2.2

sorry didn have time to do the rest hope u get an idea

The answer to 5 is t=9

The answer to 6 is x=3

Hope I’m right and hope I helped!