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x in (-oo:+oo)
(7/8)*x-(5/8) = 9 // - 9
(7/8)*x-(5/8)-9 = 0
(7/8)*x-5/8-9 = 0
7/8*x-77/8 = 0 // + 77/8
7/8*x = 77/8 // : 7/8
x = 77/8/7/8
x = 11
x = 11
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