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-23=r+-19
We move all terms to the left:
-23-(r+-19)=0
We add all the numbers together, and all the variables
-(r-19)-23=0
We get rid of parentheses
-r+19-23=0
We add all the numbers together, and all the variables
-1r-4=0
We move all terms containing r to the left, all other terms to the right
-r=4
r=4/-1
r=-4
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