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x in (-oo:+oo)
y-9 = (1/3)*(x-6) // - (1/3)*(x-6)
y-((1/3)*(x-6))-9 = 0
(-1/3)*(x-6)+y-9 = 0
y-1/3*(x-6)-9 = 0
y-1/3*(x-6)-9 = 0
y-1/3*x-9+2 = 0
y-1/3*x-7 = 0
y-1/3*x-7 = 0
y-1/3*x-7 = 0 // - y-7
-1/3*x = -(y-7) // : -1/3
x = (-(y-7))/(-1/3)
x = -3*(7-y)
x = -3*(7-y)
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