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