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x in (-oo:+oo)
x+2*x+x/2-2 = 180 // - 180
x+2*x+x/2-180-2 = 0
7/2*x-182 = 0 // + 182
7/2*x = 182 // : 7/2
x = 182/7/2
x = 52
x = 52
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