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-3n^{2}+2n-4-\left(2n^{2}-\left(n^{2}+n+3\right)\right)
To find the opposite of 3n^{2}-2n+4, find the opposite of each term.
-3n^{2}+2n-4-\left(2n^{2}-n^{2}-n-3\right)
To find the opposite of n^{2}+n+3, find the opposite of each term.
-3n^{2}+2n-4-\left(n^{2}-n-3\right)
Combine 2n^{2} and -n^{2} to get n^{2}.
-3n^{2}+2n-4-n^{2}+n+3
To find the opposite of n^{2}-n-3, find the opposite of each term.
-4n^{2}+2n-4+n+3
Combine -3n^{2} and -n^{2} to get -4n^{2}.
-4n^{2}+3n-4+3
Combine 2n and n to get 3n.
-4n^{2}+3n-1
Add -4 and 3 to get -1.
-3n^{2}+2n-4-\left(2n^{2}-\left(n^{2}+n+3\right)\right)
To find the opposite of 3n^{2}-2n+4, find the opposite of each term.
-3n^{2}+2n-4-\left(2n^{2}-n^{2}-n-3\right)
To find the opposite of n^{2}+n+3, find the opposite of each term.
-3n^{2}+2n-4-\left(n^{2}-n-3\right)
Combine 2n^{2} and -n^{2} to get n^{2}.
-3n^{2}+2n-4-n^{2}+n+3
To find the opposite of n^{2}-n-3, find the opposite of each term.
-4n^{2}+2n-4+n+3
Combine -3n^{2} and -n^{2} to get -4n^{2}.
-4n^{2}+3n-4+3
Combine 2n and n to get 3n.
-4n^{2}+3n-1
Add -4 and 3 to get -1.