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x in (-oo:+oo)
(1/3)*y = 6-x // - 6-x
x+(1/3)*y-6 = 0
x+1/3*y-6 = 0 // - 1/3*y-6
x = -(1/3*y-6)
x = 6-(1/3*y)
x = 6-(1/3*y)
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