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x in (-oo:+oo)
y = (5/2)*x-4 // - (5/2)*x-4
y-((5/2)*x)+4 = 0
(-5/2)*x+y+4 = 0
y-5/2*x+4 = 0 // - y+4
-5/2*x = -(y+4) // : -5/2
x = (-(y+4))/(-5/2)
x = 2/5*(y+4)
x = 2/5*(y+4)
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