5r+3=r+21

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Solution for 5r+3=r+21 equation: 



5r+3=r+21

We move all terms to the left:

5r+3-(r+21)=0

We get rid of parentheses

5r-r-21+3=0

We add all the numbers together, and all the variables

4r-18=0

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

4r=18

r=18/4

r=4+1/2

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