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x in (-oo:+oo)
(1/3)*x+(1/2)*x-8 = 7 // - 7
(1/3)*x+(1/2)*x-8-7 = 0
5/6*x-15 = 0 // + 15
5/6*x = 15 // : 5/6
x = 15/5/6
x = 18
x = 18
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