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v+(45+v)=105
We move all terms to the left:
v+(45+v)-(105)=0
We add all the numbers together, and all the variables
v+(v+45)-105=0
We get rid of parentheses
v+v+45-105=0
We add all the numbers together, and all the variables
2v-60=0
We move all terms containing v to the left, all other terms to the right
2v=60
v=60/2
v=30
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