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20=-2b+3b
We move all terms to the left:
20-(-2b+3b)=0
We add all the numbers together, and all the variables
-(+b)+20=0
We get rid of parentheses
-b+20=0
We add all the numbers together, and all the variables
-1b+20=0
We move all terms containing b to the left, all other terms to the right
-b=-20
b=-20/-1
b=+20
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