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