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-13r-4=-2r-59
We move all terms to the left:
-13r-4-(-2r-59)=0
We get rid of parentheses
-13r+2r+59-4=0
We add all the numbers together, and all the variables
-11r+55=0
We move all terms containing r to the left, all other terms to the right
-11r=-55
r=-55/-11
r=+5
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