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55=43+v
We move all terms to the left:
55-(43+v)=0
We add all the numbers together, and all the variables
-(v+43)+55=0
We get rid of parentheses
-v-43+55=0
We add all the numbers together, and all the variables
-1v+12=0
We move all terms containing v to the left, all other terms to the right
-v=-12
v=-12/-1
v=+12
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