Answer:
what they said
Explanation:
7x^3+7x^2+18
11x^2+8+6x^3+10-4x^2+x^3
=6x^3+x^3+11x^2-4x^2+8+10
=6x^3+x^3+7x^2+8+10
=7x^3+7x^2+8+10
=7x^3+7x^2+18
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