\(30\%\cdot y+y=52\)
\(\frac{3}{10}\cdot y+y=52\)
\(y\cdot\left(\frac{3}{10}+1\right)=52\)
\(y\cdot\frac{13}{10}=52\)
\(y=52:\frac{13}{10}\)
\(y=40\)
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