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4x - 2x - 3 = 12 - 5x
4x - 2x + 5x = 12 + 3
7x = 15
x = 15/7
2. 15 - (x - 4) + 2(x - 1) = 25
15 - x + 4 + 2x - 2 = 25
-x + 2x = 25 - 15 - 4 + 2
x = 8