2b-3=21

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Solution for 2b-3=21 equation: 



2b-3=21

We move all terms to the left:

2b-3-(21)=0

We add all the numbers together, and all the variables

2b-24=0

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

2b=24

b=24/2

b=12

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