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19r-3r-2r-10r-2r=8
We move all terms to the left:
19r-3r-2r-10r-2r-(8)=0
We add all the numbers together, and all the variables
2r-8=0
We move all terms containing r to the left, all other terms to the right
2r=8
r=8/2
r=4
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