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x -4 + x = 3x - 12 - 4
-4 = 3x - 16
3x = -12
x = -4
2. 3(2x + 1) - 4(x - 2) = 0
6x + 3 - 4x + 8 = 0
2x + 11 = 0
x = - 11/2