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