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x in (-oo:+oo)
y+3 = (-4/5)*x-4 // - (-4/5)*x-4
y-((-4/5)*x)+3+4 = 0
(4/5)*x+y+3+4 = 0
4/5*x+y+7 = 0 // - y+7
4/5*x = -(y+7) // : 4/5
x = (-(y+7))/4/5
x = -5/4*(y+7)
x = -5/4*(y+7)
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