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x in (-oo:+oo)
y = (5/4)*x+9/2 // - (5/4)*x+9/2
y-((5/4)*x)-(9/2) = 0
(-5/4)*x+y-9/2 = 0
y-5/4*x-9/2 = 0 // - y-9/2
-5/4*x = -(y-9/2) // : -5/4
x = (-(y-9/2))/(-5/4)
x = -4/5*(9/2-y)
x = -4/5*(9/2-y)
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