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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
y-5/2*x-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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