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