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x in (-oo:+oo)
(1/2)*x+(1/3)*x = 12 // - 12
(1/2)*x+(1/3)*x-12 = 0
5/6*x-12 = 0 // + 12
5/6*x = 12 // : 5/6
x = 12/5/6
x = 72/5
x = 72/5
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