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x in (-oo:+oo)
y-3 = (-4/5)*x // - (-4/5)*x
y-((-4/5)*x)-3 = 0
(4/5)*x+y-3 = 0
4/5*x+y-3 = 0 // - y-3
4/5*x = -(y-3) // : 4/5
x = (-(y-3))/4/5
x = 5/4*(3-y)
x = 5/4*(3-y)
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