x + 12 = 5, x = -7, -3 + 2(x + 4) = 25, x = 10, -3x = 18, x = -6, 6x - 8 = -18, x = -3, -15 - 2x = -5, x = -5, -6x - 2 + 3 = -35, x = 6

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