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39x^{2}+65x+53-53x^{2}+66
To find the opposite of 53x^{2}-66, find the opposite of each term.
-14x^{2}+65x+53+66
Combine 39x^{2} and -53x^{2} to get -14x^{2}.
-14x^{2}+65x+119
Add 53 and 66 to get 119.
39x^{2}+65x+53-53x^{2}+66
To find the opposite of 53x^{2}-66, find the opposite of each term.
-14x^{2}+65x+53+66
Combine 39x^{2} and -53x^{2} to get -14x^{2}.
-14x^{2}+65x+119
Add 53 and 66 to get 119.