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180-(x/2) = 2*(90-x)-18 // - 2*(90-x)-18
18-(2*(90-x))-(x/2)+180 = 0
18-2*(90-x)-(x/2)+180 = 0
18-2*(90-x)-x/2+180 = 0
(-2*2*(90-x))/2-x/2+(2*18)/2+(2*180)/2 = 0
2*18-2*2*(90-x)-x+2*180 = 0
3*x-360+36+360 = 0
3*x-324+360 = 0
3*x+36 = 0
(3*x+36)/2 = 0
(3*x+36)/2 = 0 // * 2
3*x+36 = 0
3*x+36 = 0 // - 36
3*x = -36 // : 3
x = -36/3
x = -12
x = -12
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