3b+12=87

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Solution for 3b+12=87 equation: 



3b+12=87

We move all terms to the left:

3b+12-(87)=0

We add all the numbers together, and all the variables

3b-75=0

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

3b=75

b=75/3

b=25

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