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-15v-40=23+-8v
We move all terms to the left:
-15v-40-(23+-8v)=0
We add all the numbers together, and all the variables
-15v-(-8v)-40=0
We get rid of parentheses
-15v+8v-40=0
We add all the numbers together, and all the variables
-7v-40=0
We move all terms containing v to the left, all other terms to the right
-7v=40
v=40/-7
v=-5+5/7
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