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c in (-oo:+oo)
9/14 = c/21 // - c/21
9/14-(c/21) = 0
9/14-1/21*c = 0 // - 9/14
-1/21*c = -9/14 // : -1/21
c = -9/14/(-1/21)
c = 27/2
c = 27/2
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