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12r=17.4
We move all terms to the left:
12r-(17.4)=0
We add all the numbers together, and all the variables
12r-17.4=0
We move all terms containing r to the left, all other terms to the right
12r=17.4
r=17.4/12
r=1+3.8571428571429/8.5714285714286
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