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3b-3b+4b-4b+4b=16
We move all terms to the left:
3b-3b+4b-4b+4b-(16)=0
We add all the numbers together, and all the variables
4b-16=0
We move all terms containing b to the left, all other terms to the right
4b=16
b=16/4
b=4
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