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