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45=18v-9v
We move all terms to the left:
45-(18v-9v)=0
We add all the numbers together, and all the variables
-(+9v)+45=0
We get rid of parentheses
-9v+45=0
We move all terms containing v to the left, all other terms to the right
-9v=-45
v=-45/-9
v=+5
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