25=b+21

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Solution for 25=b+21 equation: 



25=b+21

We move all terms to the left:

25-(b+21)=0

We get rid of parentheses

-b-21+25=0

We add all the numbers together, and all the variables

-1b+4=0

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

-b=-4

b=-4/-1

b=+4

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