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x in (-oo:+oo)
9/14-(8/11) = x // - x
9/14-x-(8/11) = 0
9/14-x-8/11 = 0
-x-13/154 = 0 // + 13/154
-x = 13/154 // * -1
x = -13/154
x = -13/154
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