Saling bantu gan, tolong bantu ya

(-2a)^3 (2a)^(-2/3) / (16a^4)^1/3
= - (2a)^3 (2a)^(-2/3) / (2^4.a^4)^1/3
= - (2a)^(3 - 2/3) / (2a)^(4/3)
= - (2a)^(7/3) / (2a)^(4/3)
= - (2a)^(7/3 - 4/3)
= - (2a)^(3/3)
= -2a