2b+8-3=21

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Solution for 2b+8-3=21 equation: 



2b+8-3=21

We move all terms to the left:

2b+8-3-(21)=0

We add all the numbers together, and all the variables

2b-16=0

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

2b=16

b=16/2

b=8

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