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10r-8r-10=40-32
We move all terms to the left:
10r-8r-10-(40-32)=0
We add all the numbers together, and all the variables
10r-8r-10-8=0
We add all the numbers together, and all the variables
2r-18=0
We move all terms containing r to the left, all other terms to the right
2r=18
r=18/2
r=9
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