(B+3)=3(b+7)

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Solution for (B+3)=3(b+7) equation: 



(+3)=3(B+7)

We move all terms to the left:

(+3)-(3(B+7))=0

We add all the numbers together, and all the variables

-(3(B+7))+3=0



We calculate terms in parentheses: -(3(B+7)), so:

3(B+7)

We multiply parentheses

3B+21

Back to the equation:

-(3B+21)



We get rid of parentheses

-3B-21+3=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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