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r/13+1=106
We move all terms to the left:
r/13+1-(106)=0
We add all the numbers together, and all the variables
r/13-105=0
We multiply all the terms by the denominator
r-105*13=0
We add all the numbers together, and all the variables
r-1365=0
We move all terms containing r to the left, all other terms to the right
r=1365
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