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23.1=r-16.4
We move all terms to the left:
23.1-(r-16.4)=0
We get rid of parentheses
-r+16.4+23.1=0
We add all the numbers together, and all the variables
-1r+39.5=0
We move all terms containing r to the left, all other terms to the right
-r=-39.5
r=-39.5/-1
r=39+0.5/1
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