21=20+r6

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Solution for 21=20+r6 equation: 



21=20+r6

We move all terms to the left:

21-(20+r6)=0

We add all the numbers together, and all the variables

-(+r^6+20)+21=0

We get rid of parentheses

-r^6-20+21=0

We do not support erpression: r^6

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