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x in (-oo:+oo)
50 = (1/2)*(x-180) // - (1/2)*(x-180)
50-((1/2)*(x-180)) = 0
(-1/2)*(x-180)+50 = 0
50-1/2*(x-180) = 0
50-1/2*(x-180) = 0
140-1/2*x = 0
140-1/2*x = 0
140-1/2*x = 0 // - 140
-1/2*x = -140 // : -1/2
x = -140/(-1/2)
x = 280
x = 280
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