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35=4r-9
We move all terms to the left:
35-(4r-9)=0
We get rid of parentheses
-4r+9+35=0
We add all the numbers together, and all the variables
-4r+44=0
We move all terms containing r to the left, all other terms to the right
-4r=-44
r=-44/-4
r=+11
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