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x in (-oo:+oo)
x+x+x+30/3+30/3-15+30 = 175 // - 175
x+x+x+30/3+30/3-175-15+30 = 0
3*x-140 = 0 // + 140
3*x = 140 // : 3
x = 140/3
x = 140/3
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