-4=b-21

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Solution for -4=b-21 equation: 



-4=b-21

We move all terms to the left:

-4-(b-21)=0

We get rid of parentheses

-b+21-4=0

We add all the numbers together, and all the variables

-1b+17=0

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

-b=-17

b=-17/-1

b=+17

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