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c in (-oo:+oo)
c^3 = 216/343 // - 216/343
c^3-(216/343) = 0
c^3-216/343 = 0
1*c^3 = 216/343 // : 1
c^3 = 216/343
c^3 = 216/343 // ^ 1/3
c = 6/7
c = 6/7
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