7b=4b-21

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Solution for 7b=4b-21 equation: 



7b=4b-21

We move all terms to the left:

7b-(4b-21)=0

We get rid of parentheses

7b-4b+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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