30-7x+7x=6-5x+7x

30=6+2x

30-6=6-6+2x

24=2x

2)x=10

100-8x+8x=20+8x

100=20+8x

100-20=20-20+8x

80=8x

30 – 6 = -5x + 7x

24 = 2x

Therefore x = 12.

2) 100 – 8x = 20

100 – 20 = 8x

Therefore x = 10.

30-6 = -5x + 7x

now subtract/add:

24= 2x

divide by 2:

1) 12=x

isolate x by adding 8x to both sides and subtract 20 from both sides:

100-20 = 8x

Subtract:

80 = 8x

divide by 8:

2) 10 = x

you must gather every unknown amount to the one side,and the known amounts to the other sides.

the unknown amount for you,is x.so,you have:

30-7x=6-5x

30-6=-5x+7x

24=2x

24/2=x

x=12

2.you must do the same as above….

100-8x=20

100-20=8x

80=8x

80/8=x

x=10

-7x+5x=6-30

-2x= -24

2x=24

x=24/2

x=12

2)100-8x=20

-8x=20-100

-8x=-80

8x=80

x=80/8

x=10