5r+8r=21

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Solution for 5r+8r=21 equation: 



5r+8r=21

We move all terms to the left:

5r+8r-(21)=0

We add all the numbers together, and all the variables

13r-21=0

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

13r=21

r=21/13

r=1+8/13

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