4r+3=2r+21

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Solution for 4r+3=2r+21 equation: 



4r+3=2r+21

We move all terms to the left:

4r+3-(2r+21)=0

We get rid of parentheses

4r-2r-21+3=0

We add all the numbers together, and all the variables

2r-18=0

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

2r=18

r=18/2

r=9

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