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c in (-oo:+oo)
c = 4*8.17*8500^(-1/3) // - 4*8.17*8500^(-1/3)
c-(4*8.17*8500^(-1/3)) = 0
c-32.68*8500^(-1/3) = 0
c-6.536/(1*68^(1/3)) = 0 // + -6.536/(1*68^(1/3))
c = -(-6.536/(1*68^(1/3)))
c = 6.536*68^(-(1/3))
c = 6.536*68^(-(1/3))
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