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x in (-oo:+oo)
x = (y-100)/2.8 // - (y-100)/2.8
x-((y-100)/2.8) = 0
x-0.35714286*(y-100) = 0
x-0.35714286*(y-100) = 0
x-0.35714286*y+35.714286 = 0
x-0.35714286*y+35.714286 = 0
x-0.35714286*y+35.714286 = 0 // - 35.714286-0.35714286*y
x = -(35.714286-0.35714286*y)
x = -(35.714286-0.35714286*y)
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