990=b+21

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Solution for 990=b+21 equation: 



990=b+21

We move all terms to the left:

990-(b+21)=0

We get rid of parentheses

-b-21+990=0

We add all the numbers together, and all the variables

-1b+969=0

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

-b=-969

b=-969/-1

b=+969

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