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23b+5b+2b+4b-30b=48
We move all terms to the left:
23b+5b+2b+4b-30b-(48)=0
We add all the numbers together, and all the variables
4b-48=0
We move all terms containing b to the left, all other terms to the right
4b=48
b=48/4
b=12
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