21=-7-2b

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Solution for 21=-7-2b equation: 



21=-7-2b

We move all terms to the left:

21-(-7-2b)=0

We add all the numbers together, and all the variables

-(-2b-7)+21=0

We get rid of parentheses

2b+7+21=0

We add all the numbers together, and all the variables

2b+28=0

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

2b=-28

b=-28/2

b=-14

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