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