-21=4a-19

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Solution for -21=4a-19 equation: 



-21=4a-19

We move all terms to the left:

-21-(4a-19)=0

We get rid of parentheses

-4a+19-21=0

We add all the numbers together, and all the variables

-4a-2=0

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

-4a=2

a=2/-4

a=-1/2

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