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