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x in (-oo:+oo)
(X-(2*x)-40)/2 = 180 // - 180
(X-(2*x)-40)/2-180 = 0
(X-2*x-40)/2-180 = 0
(X-2*x-40)/2+(-180*2)/2 = 0
X-2*x-180*2-40 = 0
X-2*x-400 = 0
(X-2*x-400)/2 = 0
(X-2*x-400)/2 = 0 // * 2
X-2*x-400 = 0
X-2*x-400 = 0 // - X-400
-2*x = -(X-400) // : -2
x = (-(X-400))/(-2)
x = (400-X)/(-2)
x = (400-X)/(-2)
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