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x in (-oo:+oo)
y = (-9/5)*x-(4/5) // - (-9/5)*x-(4/5)
y-((-9/5)*x)+4/5 = 0
(9/5)*x+y+4/5 = 0
9/5*x+y+4/5 = 0 // - y+4/5
9/5*x = -(y+4/5) // : 9/5
x = (-(y+4/5))/9/5
x = -5/9*(y+4/5)
x = -5/9*(y+4/5)
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