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c in (-oo:+oo)
((8/3)*c^3)/2 = 7 // - 7
((8/3)*c^3)/2-7 = 0
4/3*c^3 = 7 // : 4/3
c^3 = 21/4
c^3 = 21/4 // ^ 1/3
c = (21/4)^(1/3)
c = (21/4)^(1/3)
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