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x in (-oo:+oo)
y-9 = (-5/6)*x // - (-5/6)*x
y-((-5/6)*x)-9 = 0
(5/6)*x+y-9 = 0
5/6*x+y-9 = 0 // - y-9
5/6*x = -(y-9) // : 5/6
x = (-(y-9))/5/6
x = 6/5*(9-y)
x = 6/5*(9-y)
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