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x in (-oo:+oo)
(1/4)*x+(1/2)*x = 12 // - 12
(1/4)*x+(1/2)*x-12 = 0
3/4*x-12 = 0 // + 12
3/4*x = 12 // : 3/4
x = 12/3/4
x = 16
x = 16
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