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5.3r=-15.9
We move all terms to the left:
5.3r-(-15.9)=0
We add all the numbers together, and all the variables
5.3r+15.9=0
We move all terms containing r to the left, all other terms to the right
5.3r=-15.9
r=-15.9/5.3
r=-3+1.7763568394003E-15/5.3
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