3(2b+7)=9

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Solution for 3(2b+7)=9 equation: 



3(2b+7)=9

We move all terms to the left:

3(2b+7)-(9)=0

We multiply parentheses

6b+21-9=0

We add all the numbers together, and all the variables

6b+12=0

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

6b=-12

b=-12/6

b=-2

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