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x in (-oo:+oo)
y = (5/2)*x-6 // - (5/2)*x-6
y-((5/2)*x)+6 = 0
(-5/2)*x+y+6 = 0
y-5/2*x+6 = 0 // - y+6
-5/2*x = -(y+6) // : -5/2
x = (-(y+6))/(-5/2)
x = 2/5*(y+6)
x = 2/5*(y+6)
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