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20+2=b+b
We move all terms to the left:
20+2-(b+b)=0
We add all the numbers together, and all the variables
-(+2b)+20+2=0
We add all the numbers together, and all the variables
-(+2b)+22=0
We get rid of parentheses
-2b+22=0
We move all terms containing b to the left, all other terms to the right
-2b=-22
b=-22/-2
b=+11
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