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