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13.57=b/3+12
We move all terms to the left:
13.57-(b/3+12)=0
We get rid of parentheses
-b/3-12+13.57=0
We multiply all the terms by the denominator
-b-12*3+(13.57)*3=0
We add all the numbers together, and all the variables
-1b+4.71=0
We move all terms containing b to the left, all other terms to the right
-b=-4.71
b=-4.71/-1
b=4+0.71/1
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