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x in (-oo:+oo)
(1/4)*x+(1/2)*x = -1/8 // + -1/8
(1/4)*x+(1/2)*x-(-1/8) = 0
(1/4)*x+(1/2)*x+1/8 = 0
3/4*x+1/8 = 0 // - 1/8
3/4*x = -1/8 // : 3/4
x = -1/8/3/4
x = -1/6
x = -1/6
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