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x in (-oo:+oo)
67/45 = x+3/5 // - x+3/5
67/45-x-(3/5) = 0
67/45-x-3/5 = 0
8/9-x = 0 // - 8/9
-x = -8/9 // * -1
x = 8/9
x = 8/9
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