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100=4r+0
We move all terms to the left:
100-(4r+0)=0
We add all the numbers together, and all the variables
-(+4r)+100=0
We get rid of parentheses
-4r+100=0
We move all terms containing r to the left, all other terms to the right
-4r=-100
r=-100/-4
r=+25
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