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