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x in (-oo:+oo)
2*x+(1/2)*x+2 = 17 // - 17
2*x+(1/2)*x-17+2 = 0
5/2*x-15 = 0 // + 15
5/2*x = 15 // : 5/2
x = 15/5/2
x = 6
x = 6
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