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x in (-oo:+oo)
x+(1/2)*x+x+5 = 100 // - 100
x+(1/2)*x+x-100+5 = 0
5/2*x-95 = 0 // + 95
5/2*x = 95 // : 5/2
x = 95/5/2
x = 38
x = 38
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