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7860=4.25b+12b
We move all terms to the left:
7860-(4.25b+12b)=0
We add all the numbers together, and all the variables
-(+16.25b)+7860=0
We get rid of parentheses
-16.25b+7860=0
We move all terms containing b to the left, all other terms to the right
-16.25b=-7860
b=-7860/-16.25
b=483+9/13
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