(-2ab^2)^3*3(a^2b)^2+4a^3b^2*18a^4b^6

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(-2ab^2)^3*3(a^2b)^2+4a^3b^2*18a^4b^6(-2ab^2)^3*3(a^2b)^2+4a^3b^2*18a^4b^6(-2ab^2)^3*3(a^2b)^2+4a^3b

(-2ab^2)^3*3(a^2b)^2+4a^3b^2*18a^4b^6
(-2ab^2)^3*3(a^2b)^2+4a^3b^2*18a^4b^6

(-2ab^2)^3*3(a^2b)^2+4a^3b^2*18a^4b^6
(-2ab^2)^3*3(a^2b)^2+4a^3b^2*18a^4b^6
=(-8a^3b^6)*3(a^4b^2)+72a^7b^8
=-24a^7b^8+72a^7b^8
=48a^7b^8.