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x in (-oo:+oo)
(9/10)*x-9 = 8 // - 8
(9/10)*x-9-8 = 0
9/10*x-17 = 0 // + 17
9/10*x = 17 // : 9/10
x = 17/9/10
x = 170/9
x = 170/9
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