11=b-21

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Solution for 11=b-21 equation: 



11=b-21

We move all terms to the left:

11-(b-21)=0

We get rid of parentheses

-b+21+11=0

We add all the numbers together, and all the variables

-1b+32=0

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

-b=-32

b=-32/-1

b=+32

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