6b-4b+5b=21

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Solution for 6b-4b+5b=21 equation: 



6b-4b+5b=21

We move all terms to the left:

6b-4b+5b-(21)=0

We add all the numbers together, and all the variables

7b-21=0

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

7b=21

b=21/7

b=3

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