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215=87-v
We move all terms to the left:
215-(87-v)=0
We add all the numbers together, and all the variables
-(-1v+87)+215=0
We get rid of parentheses
1v-87+215=0
We add all the numbers together, and all the variables
v+128=0
We move all terms containing v to the left, all other terms to the right
v=-128
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