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5-4a^{3}+4a-7a^{3}-7-8a
To find the opposite of 7a^{3}+7+8a, find the opposite of each term.
5-11a^{3}+4a-7-8a
Combine -4a^{3} and -7a^{3} to get -11a^{3}.
-2-11a^{3}+4a-8a
Subtract 7 from 5 to get -2.
-2-11a^{3}-4a
Combine 4a and -8a to get -4a.
5-4a^{3}+4a-7a^{3}-7-8a
To find the opposite of 7a^{3}+7+8a, find the opposite of each term.
5-11a^{3}+4a-7-8a
Combine -4a^{3} and -7a^{3} to get -11a^{3}.
-2-11a^{3}+4a-8a
Subtract 7 from 5 to get -2.
-2-11a^{3}-4a
Combine 4a and -8a to get -4a.