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4r/2=19
We move all terms to the left:
4r/2-(19)=0
We multiply all the terms by the denominator
4r-19*2=0
We add all the numbers together, and all the variables
4r-38=0
We move all terms containing r to the left, all other terms to the right
4r=38
r=38/4
r=9+1/2
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