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x in (-oo:+oo)
y-4 = (1/6)*(x-6) // - (1/6)*(x-6)
y-((1/6)*(x-6))-4 = 0
(-1/6)*(x-6)+y-4 = 0
y-1/6*(x-6)-4 = 0
y-1/6*(x-6)-4 = 0
y-1/6*x-4+1 = 0
y-1/6*x-3 = 0
y-1/6*x-3 = 0
y-1/6*x-3 = 0 // - y-3
-1/6*x = -(y-3) // : -1/6
x = (-(y-3))/(-1/6)
x = -6*(3-y)
x = -6*(3-y)
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