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3b+4b=3.75
We move all terms to the left:
3b+4b-(3.75)=0
We add all the numbers together, and all the variables
7b-3.75=0
We move all terms containing b to the left, all other terms to the right
7b=3.75
b=3.75/7
b=2.1428571428571/4
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