8r-5r=21

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Solution for 8r-5r=21 equation: 



8r-5r=21

We move all terms to the left:

8r-5r-(21)=0

We add all the numbers together, and all the variables

3r-21=0

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

3r=21

r=21/3

r=7

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