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21+4b+9b-10=22b+17-9b-6
We move all terms to the left:
21+4b+9b-10-(22b+17-9b-6)=0
We add all the numbers together, and all the variables
4b+9b-(13b+11)+21-10=0
We add all the numbers together, and all the variables
13b-(13b+11)+11=0
We get rid of parentheses
13b-13b-11+11=0
We add all the numbers together, and all the variables
=0
b=0/1
b=0
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