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C in (-oo:+oo)
4*(2/3)^3*(1/3)^4*C^3-3 = 0
32/2187*C^3 = 3 // : 32/2187
C^3 = 6561/32
C^3 = 6561/32 // ^ 1/3
C = (6561/32)^(1/3)
C = (6561/32)^(1/3)
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