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c in (-oo:+oo)
2/3 = c/21 // - c/21
2/3-(c/21) = 0
2/3-1/21*c = 0 // - 2/3
-1/21*c = -2/3 // : -1/21
c = -2/3/(-1/21)
c = 14
c = 14
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