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x in (-oo:+oo)
8/9 = x/18 // - x/18
8/9-(x/18) = 0
8/9-1/18*x = 0 // - 8/9
-1/18*x = -8/9 // : -1/18
x = -8/9/(-1/18)
x = 16
x = 16
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