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21v-45=-18v+5
We move all terms to the left:
21v-45-(-18v+5)=0
We get rid of parentheses
21v+18v-5-45=0
We add all the numbers together, and all the variables
39v-50=0
We move all terms containing v to the left, all other terms to the right
39v=50
v=50/39
v=1+11/39
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