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1+2b-13=13-2b
We move all terms to the left:
1+2b-13-(13-2b)=0
We add all the numbers together, and all the variables
2b-(-2b+13)+1-13=0
We add all the numbers together, and all the variables
2b-(-2b+13)-12=0
We get rid of parentheses
2b+2b-13-12=0
We add all the numbers together, and all the variables
4b-25=0
We move all terms containing b to the left, all other terms to the right
4b=25
b=25/4
b=6+1/4
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