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1-5.18r+r+0.7=30.96
We move all terms to the left:
1-5.18r+r+0.7-(30.96)=0
We add all the numbers together, and all the variables
-4.18r-29.26=0
We move all terms containing r to the left, all other terms to the right
-4.18r=29.26
r=29.26/-4.18
r=-7+3.5527136788005E-15/4.18
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