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x in (-oo:+oo)
y-7 = (1/3)*(x-9) // - (1/3)*(x-9)
y-((1/3)*(x-9))-7 = 0
(-1/3)*(x-9)+y-7 = 0
y-1/3*(x-9)-7 = 0
y-1/3*(x-9)-7 = 0
y-1/3*x-7+3 = 0
y-1/3*x-4 = 0
y-1/3*x-4 = 0
y-1/3*x-4 = 0 // - y-4
-1/3*x = -(y-4) // : -1/3
x = (-(y-4))/(-1/3)
x = -3*(4-y)
x = -3*(4-y)
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