Verified answer

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3x - 4 = 8

3x = 8 + 4

3x = 12

x = 12/3

x = 4

-5x + 7 = 6

7 - 6 = 5x

1 = 5x

x = 1/5

x/4 - 2 = -7

x/4 = -7 + 2

x/4 = -5

x = (-5) * 4

x = (-20)