3a+21=a7-4a

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Solution for 3a+21=a7-4a equation: 



3a+21=a7-4a

We move all terms to the left:

3a+21-(a7-4a)=0

We add all the numbers together, and all the variables

-(+a^7-4a)+3a+21=0

We get rid of parentheses

-a^7+4a+3a+21=0

We do not support eapression: a^7

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