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x in (-oo:+oo)
y = (-5/2)*x+5/2 // - (-5/2)*x+5/2
y-((-5/2)*x)-(5/2) = 0
(5/2)*x+y-5/2 = 0
5/2*x+y-5/2 = 0 // - y-5/2
5/2*x = -(y-5/2) // : 5/2
x = (-(y-5/2))/5/2
x = 2/5*(5/2-y)
x = 2/5*(5/2-y)
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