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(12v+10)+40=20v+18
We move all terms to the left:
(12v+10)+40-(20v+18)=0
We get rid of parentheses
12v-20v+10-18+40=0
We add all the numbers together, and all the variables
-8v+32=0
We move all terms containing v to the left, all other terms to the right
-8v=-32
v=-32/-8
v=+4
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