21+8b=45

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Solution for 21+8b=45 equation: 



21+8b=45

We move all terms to the left:

21+8b-(45)=0

We add all the numbers together, and all the variables

8b-24=0

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

8b=24

b=24/8

b=3

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