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x in (-oo:+oo)
(1/2)*x+(1/5)*x = 14 // - 14
(1/2)*x+(1/5)*x-14 = 0
7/10*x-14 = 0 // + 14
7/10*x = 14 // : 7/10
x = 14/7/10
x = 20
x = 20
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