2r=-r+9

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Solution for 2r=-r+9 equation: 



2r=-r+9

We move all terms to the left:

2r-(-r+9)=0

We add all the numbers together, and all the variables

2r-(-1r+9)=0

We get rid of parentheses

2r+1r-9=0

We add all the numbers together, and all the variables

3r-9=0

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

3r=9

r=9/3

r=3

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