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310=v+-240
We move all terms to the left:
310-(v+-240)=0
We add all the numbers together, and all the variables
-(v-240)+310=0
We get rid of parentheses
-v+240+310=0
We add all the numbers together, and all the variables
-1v+550=0
We move all terms containing v to the left, all other terms to the right
-v=-550
v=-550/-1
v=+550
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