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x in (-oo:+oo)
x/9 = 8/31 // - 8/31
x/9-(8/31) = 0
x/9-8/31 = 0
1/9*x-8/31 = 0 // + 8/31
1/9*x = 8/31 // : 1/9
x = 8/31/1/9
x = 72/31
x = 72/31
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