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x in (-oo:+oo)
y = (5/2)*x-9 // - (5/2)*x-9
y-((5/2)*x)+9 = 0
(-5/2)*x+y+9 = 0
y-5/2*x+9 = 0 // - y+9
-5/2*x = -(y+9) // : -5/2
x = (-(y+9))/(-5/2)
x = 2/5*(y+9)
x = 2/5*(y+9)
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