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x in (-oo:+oo)
y = (-5/4)*x-6 // - (-5/4)*x-6
y-((-5/4)*x)+6 = 0
(5/4)*x+y+6 = 0
5/4*x+y+6 = 0 // - y+6
5/4*x = -(y+6) // : 5/4
x = (-(y+6))/5/4
x = -4/5*(y+6)
x = -4/5*(y+6)
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