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x in (-oo:+oo)
(1/4)*x+(1/2)*x = 2/3 // - 2/3
(1/4)*x+(1/2)*x-(2/3) = 0
(1/4)*x+(1/2)*x-2/3 = 0
3/4*x-2/3 = 0 // + 2/3
3/4*x = 2/3 // : 3/4
x = 2/3/3/4
x = 8/9
x = 8/9
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