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21w^{2}-13w-3
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21w^{2}-13w-3
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14w^{2}-7w-3-8w+3-\left(-7w^{2}-2w+3\right)
Combine 7w^{2} and 7w^{2} to get 14w^{2}.
14w^{2}-15w-3+3-\left(-7w^{2}-2w+3\right)
Combine -7w and -8w to get -15w.
14w^{2}-15w-\left(-7w^{2}-2w+3\right)
Add -3 and 3 to get 0.
14w^{2}-15w+7w^{2}+2w-3
To find the opposite of -7w^{2}-2w+3, find the opposite of each term.
21w^{2}-15w+2w-3
Combine 14w^{2} and 7w^{2} to get 21w^{2}.
21w^{2}-13w-3
Combine -15w and 2w to get -13w.
14w^{2}-7w-3-8w+3-\left(-7w^{2}-2w+3\right)
Combine 7w^{2} and 7w^{2} to get 14w^{2}.
14w^{2}-15w-3+3-\left(-7w^{2}-2w+3\right)
Combine -7w and -8w to get -15w.
14w^{2}-15w-\left(-7w^{2}-2w+3\right)
Add -3 and 3 to get 0.
14w^{2}-15w+7w^{2}+2w-3
To find the opposite of -7w^{2}-2w+3, find the opposite of each term.
21w^{2}-15w+2w-3
Combine 14w^{2} and 7w^{2} to get 21w^{2}.
21w^{2}-13w-3
Combine -15w and 2w to get -13w.
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