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10.3r=1.3
We move all terms to the left:
10.3r-(1.3)=0
We add all the numbers together, and all the variables
10.3r-1.3=0
We move all terms containing r to the left, all other terms to the right
10.3r=1.3
r=1.3/10.3
r=1/7.92307692308
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