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x in (-oo:+oo)
Y-((4/5)*x) = 1 // - 1
Y-((4/5)*x)-1 = 0
Y+(-4/5)*x-1 = 0
Y-4/5*x-1 = 0 // - Y-1
-4/5*x = -(Y-1) // : -4/5
x = (-(Y-1))/(-4/5)
x = -5/4*(1-Y)
x = -5/4*(1-Y)
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