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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
1-2*x = 0 // - 1
-2*x = -1 // : -2
x = -1/(-2)
x = 1/2
x = 1/2
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