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OpenStudy (anonymous):
4r^2=7r
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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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