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3x = 7 - 4
3x = 3
x = 3
b. 6x - 5 = 2x + 11
6x - 2x = 11 + 5
4x = 16
x = 4
c. 3(2x - 1) = 5(x - 1)
6x - 3 = 5x - 5
6x - 5x = -5 + 3
x = -2
d. 3x + 4(x - 2) = 3(x - 4) + 2
3x + 4x - 8 = 3x - 12 + 2
3x + 4x - 3x = -12 + 2 + 8
4x = -2
x =
e. x(4 - x) = 3(x - 4) - 4
4x - = 3x - 12 - 4
4x - 3x - = -12 -4
x- = -16
x =
x = 4