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