7s+21=77

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Solution for 7s+21=77 equation: 



7s+21=77

We move all terms to the left:

7s+21-(77)=0

We add all the numbers together, and all the variables

7s-56=0

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

7s=56

s=56/7

s=8

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