5r+3=21

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Solution for 5r+3=21 equation: 



5r+3=21

We move all terms to the left:

5r+3-(21)=0

We add all the numbers together, and all the variables

5r-18=0

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

5r=18

r=18/5

r=3+3/5

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