\(y\times12,25-y+y\times5,2=48\)
\(y\times\left(12,25-1+5,2\right)=48\)
\(y\times16,45=48\)
\(y=2,917933...\)
\(y\times12,25-y+y\times5,2=48\)
\(\Leftrightarrow y\times\left(12,25-1+5,2\right)=48\)
\(\Leftrightarrow y\times16,45=48\)
\(\Leftrightarrow y=48\div16,45\)
\(\Rightarrow y=\dfrac{960}{329}\)