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30=4v-10
We move all terms to the left:
30-(4v-10)=0
We get rid of parentheses
-4v+10+30=0
We add all the numbers together, and all the variables
-4v+40=0
We move all terms containing v to the left, all other terms to the right
-4v=-40
v=-40/-4
v=+10
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