4*12+3b=84

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Solution for 4*12+3b=84 equation: 



4*12+3b=84

We move all terms to the left:

4*12+3b-(84)=0

determiningTheFunctionDomain
3b-84+4*12=0

We add all the numbers together, and all the variables

3b-36=0

We move all terms containing b to the left, all other terms to the right

3b=36

b=36/3

b=12

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