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x in (-oo:+oo)
7/9 = 9*x // - 9*x
7/9-(9*x) = 0
7/9-9*x = 0
7/9-9*x = 0 // - 7/9
-9*x = -7/9 // : -9
x = -7/9/(-9)
x = 7/81
x = 7/81
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