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287=213-v
We move all terms to the left:
287-(213-v)=0
We add all the numbers together, and all the variables
-(-1v+213)+287=0
We get rid of parentheses
1v-213+287=0
We add all the numbers together, and all the variables
v+74=0
We move all terms containing v to the left, all other terms to the right
v=-74
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