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21x^{4}+12x-9-5x+6x^{4}-2
To find the opposite of 5x-6x^{4}+2, find the opposite of each term.
21x^{4}+7x-9+6x^{4}-2
Combine 12x and -5x to get 7x.
27x^{4}+7x-9-2
Combine 21x^{4} and 6x^{4} to get 27x^{4}.
27x^{4}+7x-11
Subtract 2 from -9 to get -11.
21x^{4}+12x-9-5x+6x^{4}-2
To find the opposite of 5x-6x^{4}+2, find the opposite of each term.
21x^{4}+7x-9+6x^{4}-2
Combine 12x and -5x to get 7x.
27x^{4}+7x-9-2
Combine 21x^{4} and 6x^{4} to get 27x^{4}.
27x^{4}+7x-11
Subtract 2 from -9 to get -11.