5-2b=21

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Solution for 5-2b=21 equation: 



5-2b=21

We move all terms to the left:

5-2b-(21)=0

We add all the numbers together, and all the variables

-2b-16=0

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

-2b=16

b=16/-2

b=-8

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