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8-5b=12b-21
We move all terms to the left:
8-5b-(12b-21)=0
We get rid of parentheses
-5b-12b+21+8=0
We add all the numbers together, and all the variables
-17b+29=0
We move all terms containing b to the left, all other terms to the right
-17b=-29
b=-29/-17
b=1+12/17
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