7b+3(b+7)=31+8b

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Solution for 7b+3(b+7)=31+8b equation: 



7b+3(b+7)=31+8b

We move all terms to the left:

7b+3(b+7)-(31+8b)=0

We add all the numbers together, and all the variables

7b+3(b+7)-(8b+31)=0

We multiply parentheses

7b+3b-(8b+31)+21=0

We get rid of parentheses

7b+3b-8b-31+21=0

We add all the numbers together, and all the variables

2b-10=0

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

2b=10

b=10/2

b=5

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