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x in (-oo:+oo)
(1/2)*x+(2/3)*x = 28 // - 28
(1/2)*x+(2/3)*x-28 = 0
7/6*x-28 = 0 // + 28
7/6*x = 28 // : 7/6
x = 28/7/6
x = 24
x = 24
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