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x in (-oo:+oo)
(1/2)*x+(1/4)*x = 5 // - 5
(1/2)*x+(1/4)*x-5 = 0
3/4*x-5 = 0 // + 5
3/4*x = 5 // : 3/4
x = 5/3/4
x = 20/3
x = 20/3
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