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x in (-oo:+oo)
y-9 = (6/2)*(x-4) // - (6/2)*(x-4)
y-((6/2)*(x-4))-9 = 0
y-3*(x-4)-9 = 0
y-3*(x-4)-9 = 0
y-3*x-9+12 = 0
y-3*x+3 = 0
y-3*x+3 = 0
y-3*x+3 = 0 // - y+3
-3*x = -(y+3) // : -3
x = (-(y+3))/(-3)
x = (y+3)/3
x = (y+3)/3
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