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4*12+3b=85
We move all terms to the left:
4*12+3b-(85)=0
determiningTheFunctionDomain 3b-85+4*12=0
We add all the numbers together, and all the variables
3b-37=0
We move all terms containing b to the left, all other terms to the right
3b=37
b=37/3
b=12+1/3
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