\[\boxed{\mathbf{3.429}}\]
\[\textbf{а)}\ x + 8x + 11 = 146\]
\[9x = 146 - 11\]
\[9x = 135\]
\[x = 135\ :9\]
\[x = 15.\]
\[\textbf{б)}\ 35x + 22x = 456\]
\[57x = 456\]
\[x = 456\ :57\]
\[x = 8.\]
\[\textbf{в)}\ 32y - 27y = 60\]
\[5y = 60\]
\[y = 60\ :5\]
\[y = 12.\]
\[\textbf{г)}\ 37z - z = 540\]
\[36z = 540\]
\[z = 540\ :36\]
\[z = 15.\]