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x in (-oo:+oo)
(1/2)*x+x+15 = 180 // - 180
(1/2)*x+x-180+15 = 0
3/2*x-165 = 0 // + 165
3/2*x = 165 // : 3/2
x = 165/3/2
x = 110
x = 110
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