(13b-3)-3(4b+1)=-7

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Solution for (13b-3)-3(4b+1)=-7 equation: 



(13b-3)-3(4b+1)=-7

We move all terms to the left:

(13b-3)-3(4b+1)-(-7)=0

We add all the numbers together, and all the variables

(13b-3)-3(4b+1)+7=0

We multiply parentheses

(13b-3)-12b-3+7=0

We get rid of parentheses

13b-12b-3-3+7=0

We add all the numbers together, and all the variables

b+1=0

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

b=-1

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