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-399=21(v+550)
We move all terms to the left:
-399-(21(v+550))=0
We calculate terms in parentheses: -(21(v+550)), so:We get rid of parentheses
21(v+550)
We multiply parentheses
21v+11550
Back to the equation:
-(21v+11550)
-21v-11550-399=0
We add all the numbers together, and all the variables
-21v-11949=0
We move all terms containing v to the left, all other terms to the right
-21v=11949
v=11949/-21
v=-569
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