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x in (-oo:+oo)
X = (1/2)*(90-x) // - (1/2)*(90-x)
X-((1/2)*(90-x)) = 0
(-1/2)*(90-x)+X = 0
X-1/2*(90-x) = 0
X-1/2*(90-x) = 0
X+1/2*x-45 = 0
X+1/2*x-45 = 0
X+1/2*x-45 = 0 // - X-45
1/2*x = -(X-45) // : 1/2
x = (-(X-45))/1/2
x = 2*(45-X)
x = 2*(45-X)
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