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x in (-oo:+oo)
5/13-(2*x) = 8/13 // - 8/13
5/13-(2*x)-(8/13) = 0
5/13-2*x-8/13 = 0
-2*x-3/13 = 0 // + 3/13
-2*x = 3/13 // : -2
x = 3/13/(-2)
x = -3/26
x = -3/26
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