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x in (-oo:+oo)
(1/3)*x+(1/2)*x = 1/8 // - 1/8
(1/3)*x+(1/2)*x-(1/8) = 0
(1/3)*x+(1/2)*x-1/8 = 0
5/6*x-1/8 = 0 // + 1/8
5/6*x = 1/8 // : 5/6
x = 1/8/5/6
x = 3/20
x = 3/20
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