7b-2-4b=21

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Solution for 7b-2-4b=21 equation: 



7b-2-4b=21

We move all terms to the left:

7b-2-4b-(21)=0

We add all the numbers together, and all the variables

3b-23=0

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

3b=23

b=23/3

b=7+2/3

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