4b+-7=b+21

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Solution for 4b+-7=b+21 equation: 



4b+-7=b+21

We move all terms to the left:

4b+-7-(b+21)=0

We add all the numbers together, and all the variables

4b-(b+21)=0

We get rid of parentheses

4b-b-21=0

We add all the numbers together, and all the variables

3b-21=0

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

3b=21

b=21/3

b=7

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