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1-r=5r-5r
We move all terms to the left:
1-r-(5r-5r)=0
We add all the numbers together, and all the variables
-r+1-0=0
We add all the numbers together, and all the variables
-1r+1=0
We move all terms containing r to the left, all other terms to the right
-r=-1
r=-1/-1
r=1
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