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