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12+9b+15-5b=14-8b+6
We move all terms to the left:
12+9b+15-5b-(14-8b+6)=0
We add all the numbers together, and all the variables
9b-5b-(-8b+20)+12+15=0
We add all the numbers together, and all the variables
4b-(-8b+20)+27=0
We get rid of parentheses
4b+8b-20+27=0
We add all the numbers together, and all the variables
12b+7=0
We move all terms containing b to the left, all other terms to the right
12b=-7
b=-7/12
b=-7/12
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