7r-12=4r+21

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Solution for 7r-12=4r+21 equation: 



7r-12=4r+21

We move all terms to the left:

7r-12-(4r+21)=0

We get rid of parentheses

7r-4r-21-12=0

We add all the numbers together, and all the variables

3r-33=0

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

3r=33

r=33/3

r=11

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