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