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x in (-oo:+oo)
8*x-(39/(-13)) = 11 // - 11
8*x-(39/(-13))-11 = 0
8*x-11+3 = 0
8*x-8 = 0 // + 8
8*x = 8 // : 8
x = 8/8
x = 1
x = 1
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