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x in (-oo:+oo)
(1/4)*x+(1/8)*x = -9 // + 9
(1/4)*x+(1/8)*x+9 = 0
3/8*x+9 = 0 // - 9
3/8*x = -9 // : 3/8
x = -9/3/8
x = -24
x = -24
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