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x in (-oo:+oo)
y-9 = (5/6)*(x-9) // - (5/6)*(x-9)
y-((5/6)*(x-9))-9 = 0
(-5/6)*(x-9)+y-9 = 0
y-5/6*(x-9)-9 = 0
y-5/6*(x-9)-9 = 0
y-5/6*x-9+15/2 = 0
y-5/6*x-3/2 = 0
y-5/6*x-3/2 = 0
y-5/6*x-3/2 = 0 // - y-3/2
-5/6*x = -(y-3/2) // : -5/6
x = (-(y-3/2))/(-5/6)
x = -6/5*(3/2-y)
x = -6/5*(3/2-y)
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