21-2b=11

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Solution for 21-2b=11 equation: 



21-2b=11

We move all terms to the left:

21-2b-(11)=0

We add all the numbers together, and all the variables

-2b+10=0

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

-2b=-10

b=-10/-2

b=+5

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