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x in (-oo:+oo)
5/7-(1/3) = x/9 // - x/9
5/7-(x/9)-(1/3) = 0
5/7-(x/9)-1/3 = 0
8/21-1/9*x = 0 // - 8/21
-1/9*x = -8/21 // : -1/9
x = -8/21/(-1/9)
x = 24/7
x = 24/7
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