21=5r+r-6r

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Solution for 21=5r+r-6r equation: 



21=5r+r-6r

We move all terms to the left:

21-(5r+r-6r)=0

We add all the numbers together, and all the variables

21-0=0

We add all the numbers together, and all the variables

21!=0

There is no solution for this equation

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