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x in (-oo:+oo)
y-3 = (1/3)*(x-1) // - (1/3)*(x-1)
y-((1/3)*(x-1))-3 = 0
(-1/3)*(x-1)+y-3 = 0
y-1/3*(x-1)-3 = 0
y-1/3*(x-1)-3 = 0
y-1/3*x-3+1/3 = 0
y-1/3*x-8/3 = 0
y-1/3*x-8/3 = 0
y-1/3*x-8/3 = 0 // - y-8/3
-1/3*x = -(y-8/3) // : -1/3
x = (-(y-8/3))/(-1/3)
x = -3*(8/3-y)
x = -3*(8/3-y)
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