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Mathematics
OpenStudy (anonymous):

4r^2=7r

OpenStudy (anonymous):

r = 0, 7/4

OpenStudy (mertsj):

\[4r^2-7r=0\] \[r(4r-7)=0\] \[r=0 or 4r-7=0\] \[r=0 , r=\frac{7}{4}\]

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