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(1/4)*x+12 = (-1/4)*x // - (-1/4)*x
(1/4)*x-((-1/4)*x)+12 = 0
(1/4)*x+(1/4)*x+12 = 0
1/2*x+12 = 0 // - 12
1/2*x = -12 // : 1/2
x = -12/1/2
x = -24
x = -24
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