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4+4b=7b-7b
We move all terms to the left:
4+4b-(7b-7b)=0
We add all the numbers together, and all the variables
4b+4-0=0
We add all the numbers together, and all the variables
4b+4=0
We move all terms containing b to the left, all other terms to the right
4b=-4
b=-4/4
b=-1
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