2b+4b=21

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Solution for 2b+4b=21 equation: 



2b+4b=21

We move all terms to the left:

2b+4b-(21)=0

We add all the numbers together, and all the variables

6b-21=0

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

6b=21

b=21/6

b=3+1/2

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