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5(5r-4)=25r-20
We move all terms to the left:
5(5r-4)-(25r-20)=0
We multiply parentheses
25r-(25r-20)-20=0
We get rid of parentheses
25r-25r+20-20=0
We add all the numbers together, and all the variables
=0
r=0/1
r=0
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