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3b/7-1=2
We move all terms to the left:
3b/7-1-(2)=0
We add all the numbers together, and all the variables
3b/7-3=0
We multiply all the terms by the denominator
3b-3*7=0
We add all the numbers together, and all the variables
3b-21=0
We move all terms containing b to the left, all other terms to the right
3b=21
b=21/3
b=7
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