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x in (-oo:+oo)
1/1-x/(-3) = x // - x
1/1-x/(-3)-x = 0
1-x/(-3)-x = 0
1-2/3*x = 0 // - 1
-2/3*x = -1 // : -2/3
x = -1/(-2/3)
x = 3/2
x = 3/2
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