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- 4x = 1
x= 1/-4
b. x - 12 = 2x + 13
- 12 - 13 = 2x - x
-25 = x
c. -5x - 4x + 10 = 1
-9x = 1 - 10
x = 1
d. 2 + x/4 = 5
x/4= 5 - 2
x/4= 3
x = 12