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2r+5=8+15
We move all terms to the left:
2r+5-(8+15)=0
We add all the numbers together, and all the variables
2r+5-23=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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