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9b-12=8-13b
We move all terms to the left:
9b-12-(8-13b)=0
We add all the numbers together, and all the variables
9b-(-13b+8)-12=0
We get rid of parentheses
9b+13b-8-12=0
We add all the numbers together, and all the variables
22b-20=0
We move all terms containing b to the left, all other terms to the right
22b=20
b=20/22
b=10/11
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