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5r=6r-9
We move all terms to the left:
5r-(6r-9)=0
We get rid of parentheses
5r-6r+9=0
We add all the numbers together, and all the variables
-1r+9=0
We move all terms containing r to the left, all other terms to the right
-r=-9
r=-9/-1
r=+9
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