4a+21=77

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Solution for 4a+21=77 equation: 



4a+21=77

We move all terms to the left:

4a+21-(77)=0

We add all the numbers together, and all the variables

4a-56=0

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

4a=56

a=56/4

a=14

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