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12.6+b=15.7b=15.7-12.6b=3.
We move all terms to the left:
12.6+b-(15.7b)=0
We add all the numbers together, and all the variables
b-(+15.7b)+12.6=0
We get rid of parentheses
b-15.7b+12.6=0
We add all the numbers together, and all the variables
-14.7b+12.6=0
We move all terms containing b to the left, all other terms to the right
-14.7b=-12.6
b=-12.6/-14.7
b=4.8461538461538/5.6538461538462
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