21-2b=13

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Solution for 21-2b=13 equation: 



21-2b=13

We move all terms to the left:

21-2b-(13)=0

We add all the numbers together, and all the variables

-2b+8=0

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

-2b=-8

b=-8/-2

b=+4

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