r-9=9-r

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Solution for r-9=9-r equation: 



r-9=9-r

We move all terms to the left:

r-9-(9-r)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

r+1r-9-9=0

We add all the numbers together, and all the variables

2r-18=0

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

2r=18

r=18/2

r=9

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