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x in (-oo:+oo)
x/13-x = 2/3 // - 2/3
x/13-x-(2/3) = 0
x/13-x-2/3 = 0
-12/13*x-2/3 = 0 // + 2/3
-12/13*x = 2/3 // : -12/13
x = 2/3/(-12/13)
x = -13/18
x = -13/18
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