2b+1+2b=21

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Solution for 2b+1+2b=21 equation: 



2b+1+2b=21

We move all terms to the left:

2b+1+2b-(21)=0

We add all the numbers together, and all the variables

4b-20=0

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

4b=20

b=20/4

b=5

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