7b+4+3=21

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Solution for 7b+4+3=21 equation: 



7b+4+3=21

We move all terms to the left:

7b+4+3-(21)=0

We add all the numbers together, and all the variables

7b-14=0

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

7b=14

b=14/7

b=2

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