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6r-34+2r-56.5=42
We move all terms to the left:
6r-34+2r-56.5-(42)=0
We add all the numbers together, and all the variables
8r-132.5=0
We move all terms containing r to the left, all other terms to the right
8r=132.5
r=132.5/8
r=16+1/1.77777777778
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