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