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