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2r-3+r-8+2r+9+r-4=72
We move all terms to the left:
2r-3+r-8+2r+9+r-4-(72)=0
We add all the numbers together, and all the variables
6r-78=0
We move all terms containing r to the left, all other terms to the right
6r=78
r=78/6
r=13
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