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x in (-oo:+oo)
x = (180-x)/2-12 // - (180-x)/2-12
x-((180-x)/2)+12 = 0
(-1*(180-x))/2+x+12 = 0
(-1*(180-x))/2+(2*x)/2+(2*12)/2 = 0
2*x-1*(180-x)+2*12 = 0
3*x-180+24 = 0
3*x-156 = 0
(3*x-156)/2 = 0
(3*x-156)/2 = 0 // * 2
3*x-156 = 0
3*x-156 = 0 // + 156
3*x = 156 // : 3
x = 156/3
x = 52
x = 52
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