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