21=b+13

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Solution for 21=b+13 equation: 



21=b+13

We move all terms to the left:

21-(b+13)=0

We get rid of parentheses

-b-13+21=0

We add all the numbers together, and all the variables

-1b+8=0

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

-b=-8

b=-8/-1

b=+8

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