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-16+r=20-r
We move all terms to the left:
-16+r-(20-r)=0
We add all the numbers together, and all the variables
r-(-1r+20)-16=0
We get rid of parentheses
r+1r-20-16=0
We add all the numbers together, and all the variables
2r-36=0
We move all terms containing r to the left, all other terms to the right
2r=36
r=36/2
r=18
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