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x in (-oo:+oo)
y-9 = (1/3)*(x+0) // - (1/3)*(x+0)
y-((1/3)*(x+0))-9 = 0
(-1/3)*x+y-9 = 0
y-1/3*x-9 = 0 // - y-9
-1/3*x = -(y-9) // : -1/3
x = (-(y-9))/(-1/3)
x = -3*(9-y)
x = -3*(9-y)
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