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x in (-oo:+oo)
3/1-x = x+5/1 // - x+5/1
3/1-x-x-(5/1) = 0
3-x-x-5 = 0
-2*x-2 = 0 // + 2
-2*x = 2 // : -2
x = 2/(-2)
x = -1
x = -1
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