7b+21=77

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Solution for 7b+21=77 equation: 



7b+21=77

We move all terms to the left:

7b+21-(77)=0

We add all the numbers together, and all the variables

7b-56=0

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

7b=56

b=56/7

b=8

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