2=r2+7r-r2-9

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Solution for 2=r2+7r-r2-9 equation: 



2=r2+7r-r2-9

We move all terms to the left:

2-(r2+7r-r2-9)=0

We add all the numbers together, and all the variables

-(7r-9)+2=0

We get rid of parentheses

-7r+9+2=0

We add all the numbers together, and all the variables

-7r+11=0

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

-7r=-11

r=-11/-7

r=1+4/7

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