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x in (-oo:+oo)
x+x/2+2*x+5 = 180 // - 180
x+x/2+2*x-180+5 = 0
7/2*x-175 = 0 // + 175
7/2*x = 175 // : 7/2
x = 175/7/2
x = 50
x = 50
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