21=v4-16

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Solution for 21=v4-16 equation: 



21=v4-16

We move all terms to the left:

21-(v4-16)=0

We add all the numbers together, and all the variables

-(+v^4-16)+21=0

We get rid of parentheses

-v^4+16+21=0

We do not support evpression: v^4

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