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78=165-v
We move all terms to the left:
78-(165-v)=0
We add all the numbers together, and all the variables
-(-1v+165)+78=0
We get rid of parentheses
1v-165+78=0
We add all the numbers together, and all the variables
v-87=0
We move all terms containing v to the left, all other terms to the right
v=87
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