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4160=4000r*1
We move all terms to the left:
4160-(4000r*1)=0
We add all the numbers together, and all the variables
-(+4000r*1)+4160=0
We get rid of parentheses
-4000r*1+4160=0
Wy multiply elements
-4000r+4160=0
We move all terms containing r to the left, all other terms to the right
-4000r=-4160
r=-4160/-4000
r=1+1/25
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