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3.5r-8+3r=-29.5
We move all terms to the left:
3.5r-8+3r-(-29.5)=0
We add all the numbers together, and all the variables
6.5r+21.5=0
We move all terms containing r to the left, all other terms to the right
6.5r=-21.5
r=-21.5/6.5
r=-3+1/3.25
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