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3x - 4x= 8 +2
-x = 10
x= -10
b. 5 (x-1) =4x
5x-5 = 4x
-5 = 4x - 5x
-5 = -x
x= 5
e. 2 (5 - 2x) = 3 (5 - x)
10 - 4x = 15 - 3x
10-15 = -3x +4x
-5 = x
x= -5