2b-15=21

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Solution for 2b-15=21 equation: 



2b-15=21

We move all terms to the left:

2b-15-(21)=0

We add all the numbers together, and all the variables

2b-36=0

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

2b=36

b=36/2

b=18

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