\(y\times11-y=214\times135\\ \Rightarrow y\times10=28890\\ \Rightarrow y=2889\)
\(\Rightarrow y\times\left(11-1\right)=28890\)
\(\Rightarrow y\times10=28890\)
\(\Rightarrow y=28890:10\)
\(\Rightarrow y=2889\)
y x 11 - y = 214 x 135
y x 10 = 28890
y = 28890 : 10 = 2889.