Question 848545
The key is to do the inverse operation to solve.

1)  4x - 12 = 8

Add 12 to both sides.

4x = 20

divide by 4.

{{{highlight(x = 5)}}}

2) 6+ (-x/2) =14

subtract 6.

-x/2 = 8

multiply by 2.

-x = 16

multiply by -1

{{{highlight(x = -16)}}}

3) -3+5x-7 = 20

5x - 10 = =20  (just simplifying the left)

add 10

5x = 30

divide by 5

{{{highlight(x = 6)}}}