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-4r-9=5r+27
We move all terms to the left:
-4r-9-(5r+27)=0
We get rid of parentheses
-4r-5r-27-9=0
We add all the numbers together, and all the variables
-9r-36=0
We move all terms containing r to the left, all other terms to the right
-9r=36
r=36/-9
r=-4
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