2b+21+b=90

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Solution for 2b+21+b=90 equation: 



2b+21+b=90

We move all terms to the left:

2b+21+b-(90)=0

We add all the numbers together, and all the variables

3b-69=0

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

3b=69

b=69/3

b=23

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