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253=142-v
We move all terms to the left:
253-(142-v)=0
We add all the numbers together, and all the variables
-(-1v+142)+253=0
We get rid of parentheses
1v-142+253=0
We add all the numbers together, and all the variables
v+111=0
We move all terms containing v to the left, all other terms to the right
v=-111
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