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x in (-oo:+oo)
(1/2)*x+x+30 = 180 // - 180
(1/2)*x+x-180+30 = 0
3/2*x-150 = 0 // + 150
3/2*x = 150 // : 3/2
x = 150/3/2
x = 100
x = 100
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