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7v-83=8v-98
We move all terms to the left:
7v-83-(8v-98)=0
We get rid of parentheses
7v-8v+98-83=0
We add all the numbers together, and all the variables
-1v+15=0
We move all terms containing v to the left, all other terms to the right
-v=-15
v=-15/-1
v=+15
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