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-19-4r=-20r+13
We move all terms to the left:
-19-4r-(-20r+13)=0
We get rid of parentheses
-4r+20r-13-19=0
We add all the numbers together, and all the variables
16r-32=0
We move all terms containing r to the left, all other terms to the right
16r=32
r=32/16
r=2
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