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500=1000*r*5/26
We move all terms to the left:
500-(1000*r*5/26)=0
We add all the numbers together, and all the variables
-(+1000*r*5/26)+500=0
We get rid of parentheses
-1000*r*5/26+500=0
We multiply all the terms by the denominator
-1000*r*5+500*26=0
We add all the numbers together, and all the variables
-1000*r*5+13000=0
Wy multiply elements
-5000r*5+13000=0
Wy multiply elements
-25000r+13000=0
We move all terms containing r to the left, all other terms to the right
-25000r=-13000
r=-13000/-25000
r=13/25
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