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-16r-5r-18=18-18r
We move all terms to the left:
-16r-5r-18-(18-18r)=0
We add all the numbers together, and all the variables
-16r-5r-(-18r+18)-18=0
We add all the numbers together, and all the variables
-21r-(-18r+18)-18=0
We get rid of parentheses
-21r+18r-18-18=0
We add all the numbers together, and all the variables
-3r-36=0
We move all terms containing r to the left, all other terms to the right
-3r=36
r=36/-3
r=-12
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