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