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2v+10=-2v-10
We move all terms to the left:
2v+10-(-2v-10)=0
We get rid of parentheses
2v+2v+10+10=0
We add all the numbers together, and all the variables
4v+20=0
We move all terms containing v to the left, all other terms to the right
4v=-20
v=-20/4
v=-5
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