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x in (-oo:+oo)
(8/5)*x-9 = 8 // - 8
(8/5)*x-9-8 = 0
8/5*x-17 = 0 // + 17
8/5*x = 17 // : 8/5
x = 17/8/5
x = 85/8
x = 85/8
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