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x in (-oo:+oo)
x = (y-100)/2 // - (y-100)/2
x-((y-100)/2) = 0
(-1*(y-100))/2+x = 0
(-1*(y-100))/2+(2*x)/2 = 0
2*x-1*(y-100) = 0
2*x-y+100 = 0
(2*x-y+100)/2 = 0
(2*x-y+100)/2 = 0 // * 2
2*x-y+100 = 0
2*x-y+100 = 0 // - 100-y
2*x = -(100-y) // : 2
x = (-(100-y))/2
x = (y-100)/2
x = (y-100)/2
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