-9+r=-3r+7

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Solution for -9+r=-3r+7 equation: 



-9+r=-3r+7

We move all terms to the left:

-9+r-(-3r+7)=0

We get rid of parentheses

r+3r-7-9=0

We add all the numbers together, and all the variables

4r-16=0

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

4r=16

r=16/4

r=4

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