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20=10+2v
We move all terms to the left:
20-(10+2v)=0
We add all the numbers together, and all the variables
-(2v+10)+20=0
We get rid of parentheses
-2v-10+20=0
We add all the numbers together, and all the variables
-2v+10=0
We move all terms containing v to the left, all other terms to the right
-2v=-10
v=-10/-2
v=+5
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