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-r-16=2r-19
We move all terms to the left:
-r-16-(2r-19)=0
We add all the numbers together, and all the variables
-1r-(2r-19)-16=0
We get rid of parentheses
-1r-2r+19-16=0
We add all the numbers together, and all the variables
-3r+3=0
We move all terms containing r to the left, all other terms to the right
-3r=-3
r=-3/-3
r=1
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