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