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b/4+9=12
We move all terms to the left:
b/4+9-(12)=0
We add all the numbers together, and all the variables
b/4-3=0
We multiply all the terms by the denominator
b-3*4=0
We add all the numbers together, and all the variables
b-12=0
We move all terms containing b to the left, all other terms to the right
b=12
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