-5v2+v-4+(3v2+7v+6)
Remove parentheses.
-5v2+v-4+3v2+7v+6
Add -5v2 and 3v2.
-2v2+v-4+7v+6
Add v and 7v.
-2v2+8v-4+6
Add -4 and 6.
-2v2+8v+2
Simplify -5v^2+v-4+(3v^2+7v+6)
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