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1. 3(2x + 6) = 4(x - 1)
=> 6x + 18 = 4x - 4
=> 2x = -22, maka x = -11.
2. 2(4x - 1(x + 3)) = 2x + 6
=> 8x - 2x - 6 = 2x + 6
=> 4x = 12, maka x = 3.