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