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5.3-2r=8.7
We move all terms to the left:
5.3-2r-(8.7)=0
We add all the numbers together, and all the variables
-2r-3.4=0
We move all terms containing r to the left, all other terms to the right
-2r=3.4
r=3.4/-2
r=-1+1/1.42857142857
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