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12=7v-23
We move all terms to the left:
12-(7v-23)=0
We get rid of parentheses
-7v+23+12=0
We add all the numbers together, and all the variables
-7v+35=0
We move all terms containing v to the left, all other terms to the right
-7v=-35
v=-35/-7
v=+5
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