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121=9v+49
We move all terms to the left:
121-(9v+49)=0
We get rid of parentheses
-9v-49+121=0
We add all the numbers together, and all the variables
-9v+72=0
We move all terms containing v to the left, all other terms to the right
-9v=-72
v=-72/-9
v=+8
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