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x in (-oo:+oo)
(1/2)*x+x+x+5 = 35 // - 35
(1/2)*x+x+x-35+5 = 0
5/2*x-30 = 0 // + 30
5/2*x = 30 // : 5/2
x = 30/5/2
x = 12
x = 12
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