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