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