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-20+b=-b+20
We move all terms to the left:
-20+b-(-b+20)=0
We add all the numbers together, and all the variables
b-(-1b+20)-20=0
We get rid of parentheses
b+1b-20-20=0
We add all the numbers together, and all the variables
2b-40=0
We move all terms containing b to the left, all other terms to the right
2b=40
b=40/2
b=20
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