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1.6r=31.3
We move all terms to the left:
1.6r-(31.3)=0
We add all the numbers together, and all the variables
1.6r-31.3=0
We move all terms containing r to the left, all other terms to the right
1.6r=31.3
r=31.3/1.6
r=19+0.9/1.6
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