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-9-3r=4-6r+5
We move all terms to the left:
-9-3r-(4-6r+5)=0
We add all the numbers together, and all the variables
-3r-(-6r+9)-9=0
We get rid of parentheses
-3r+6r-9-9=0
We add all the numbers together, and all the variables
3r-18=0
We move all terms containing r to the left, all other terms to the right
3r=18
r=18/3
r=6
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