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x in (-oo:+oo)
x/9-8 = 7/8 // - 7/8
x/9-(7/8)-8 = 0
x/9-7/8-8 = 0
1/9*x-71/8 = 0 // + 71/8
1/9*x = 71/8 // : 1/9
x = 71/8/1/9
x = 639/8
x = 639/8
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