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x in (-oo:+oo)
(1/2)*x+(2/3)*x = 14 // - 14
(1/2)*x+(2/3)*x-14 = 0
7/6*x-14 = 0 // + 14
7/6*x = 14 // : 7/6
x = 14/7/6
x = 12
x = 12
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