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x in (-oo:+oo)
(8/9)*x = 23/30 // - 23/30
(8/9)*x-(23/30) = 0
(8/9)*x-23/30 = 0
8/9*x-23/30 = 0 // + 23/30
8/9*x = 23/30 // : 8/9
x = 23/30/8/9
x = 69/80
x = 69/80
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