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x in (-oo:+oo)
11/7 = x/9 // - x/9
11/7-(x/9) = 0
11/7-1/9*x = 0 // - 11/7
-1/9*x = -11/7 // : -1/9
x = -11/7/(-1/9)
x = 99/7
x = 99/7
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