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x in (-oo:+oo)
y = (-5/4)*x-1 // - (-5/4)*x-1
y-((-5/4)*x)+1 = 0
(5/4)*x+y+1 = 0
5/4*x+y+1 = 0 // - y+1
5/4*x = -(y+1) // : 5/4
x = (-(y+1))/5/4
x = -4/5*(y+1)
x = -4/5*(y+1)
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