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2b-(-5b)+7b-(-2b)+10b-5b=
We move all terms to the left:
2b-(-5b)+7b-(-2b)+10b-5b-()=0
We add all the numbers together, and all the variables
14b-(-5b)-(-2b)=0
We get rid of parentheses
14b+5b+2b=0
We add all the numbers together, and all the variables
21b=0
b=0/21
b=0
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