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-10r+1.5+2r+1.5=-64
We move all terms to the left:
-10r+1.5+2r+1.5-(-64)=0
We add all the numbers together, and all the variables
-8r+67=0
We move all terms containing r to the left, all other terms to the right
-8r=-67
r=-67/-8
r=8+3/8
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