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4r-19=2r-3
We move all terms to the left:
4r-19-(2r-3)=0
We get rid of parentheses
4r-2r+3-19=0
We add all the numbers together, and all the variables
2r-16=0
We move all terms containing r to the left, all other terms to the right
2r=16
r=16/2
r=8
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