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x in (-oo:+oo)
x/7 = 8/9 // - 8/9
x/7-(8/9) = 0
x/7-8/9 = 0
1/7*x-8/9 = 0 // + 8/9
1/7*x = 8/9 // : 1/7
x = 8/9/1/7
x = 56/9
x = 56/9
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