7r-15=4r+12

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Solution for 7r-15=4r+12 equation: 



7r-15=4r+12

We move all terms to the left:

7r-15-(4r+12)=0

We get rid of parentheses

7r-4r-12-15=0

We add all the numbers together, and all the variables

3r-27=0

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

3r=27

r=27/3

r=9

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