-21=5a+4=-1

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Solution for -21=5a+4=-1 equation: 



-21=5a+4=-1

We move all terms to the left:

-21-(5a+4)=0

We get rid of parentheses

-5a-4-21=0

We add all the numbers together, and all the variables

-5a-25=0

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

-5a=25

a=25/-5

a=-5

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