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13/26=39r
We move all terms to the left:
13/26-(39r)=0
We multiply all the terms by the denominator
-39r*26+13=0
Wy multiply elements
-1014r+13=0
We move all terms containing r to the left, all other terms to the right
-1014r=-13
r=-13/-1014
r=1/78
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