(-168)^(6/7)
[(-168)^6]^(1/7)
[(168)^6]^(1/7) Ignore the negative sign with an even exponent
[168]^(6/7)
[8*16]^(6/7)
[2^3 * 2^4]^(6/7)
[2^7]^(6/7)
[(2^7)^(1/7)]^6
[2]^6
2^3 * 2^3
8 * 8
64
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