3b-30=12

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Solution for 3b-30=12 equation: 



3b-30=12

We move all terms to the left:

3b-30-(12)=0

We add all the numbers together, and all the variables

3b-42=0

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

3b=42

b=42/3

b=14

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