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126=9v+9
We move all terms to the left:
126-(9v+9)=0
We get rid of parentheses
-9v-9+126=0
We add all the numbers together, and all the variables
-9v+117=0
We move all terms containing v to the left, all other terms to the right
-9v=-117
v=-117/-9
v=+13
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