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c in (-oo:+oo)
c/9 = 7/8 // - 7/8
c/9-(7/8) = 0
c/9-7/8 = 0
1/9*c-7/8 = 0 // + 7/8
1/9*c = 7/8 // : 1/9
c = 7/8/1/9
c = 63/8
c = 63/8
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