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b/3+-9=-7
We move all terms to the left:
b/3+-9-(-7)=0
We add all the numbers together, and all the variables
b/3-2=0
We multiply all the terms by the denominator
b-2*3=0
We add all the numbers together, and all the variables
b-6=0
We move all terms containing b to the left, all other terms to the right
b=6
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