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3v+21=2v+4(v+6)
We move all terms to the left:
3v+21-(2v+4(v+6))=0
We calculate terms in parentheses: -(2v+4(v+6)), so:We get rid of parentheses
2v+4(v+6)
We multiply parentheses
2v+4v+24
We add all the numbers together, and all the variables
6v+24
Back to the equation:
-(6v+24)
3v-6v-24+21=0
We add all the numbers together, and all the variables
-3v-3=0
We move all terms containing v to the left, all other terms to the right
-3v=3
v=3/-3
v=-1
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