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x in (-oo:+oo)
180-((180-x)/2) = 0
(-1*(180-x))/2+180 = 0
(-1*(180-x))/2+(2*180)/2 = 0
2*180-1*(180-x) = 0
x+180 = 0
(x+180)/2 = 0
(x+180)/2 = 0 // * 2
x+180 = 0
x+180 = 0 // - 180
x = -180
x = -180
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