12+3(b)=30

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Solution for 12+3(b)=30 equation: 



12+3(b)=30

We move all terms to the left:

12+3(b)-(30)=0

We add all the numbers together, and all the variables

3b-18=0

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

3b=18

b=18/3

b=6

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