5r-15=2r+21

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Solution for 5r-15=2r+21 equation: 



5r-15=2r+21

We move all terms to the left:

5r-15-(2r+21)=0

We get rid of parentheses

5r-2r-21-15=0

We add all the numbers together, and all the variables

3r-36=0

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

3r=36

r=36/3

r=12

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