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2=-2+r/9
We move all terms to the left:
2-(-2+r/9)=0
We add all the numbers together, and all the variables
-(r/9-2)+2=0
We get rid of parentheses
-r/9+2+2=0
We multiply all the terms by the denominator
-r+2*9+2*9=0
We add all the numbers together, and all the variables
-1r+36=0
We move all terms containing r to the left, all other terms to the right
-r=-36
r=-36/-1
r=+36
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