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-3x + 3x = 12-x-6(1/4-x)
x-12 = -6/4 x +6x
x-12 = -3/2 x +6x; multiplicando todo por 2
2x-24 = -3x + 12x
2x+3x-12x = 24
-7x = 24
x = -24/7