\[\boxed{\mathbf{3.}\mathbf{206}}\]
\[\textbf{а)}\ 9z - 5z = 68\]
\[4z = 68\]
\[z = 68\ :4\]
\[z = 17.\]
\[\textbf{б)}\ 27p - 9p = 126\]
\[18p = 126\]
\[p = 126\ :18\]
\[p = 7.\]
\[\textbf{в)}\ 25c - 15c = 12\ 120\]
\[10c = 12\ 120\]
\[c = 12\ 120\ :10\]
\[c = 1212.\ \]
\[\textbf{г)}\ 2x + 9x = 5533\]
\[11x = 5533\]
\[x = 5533\ :11\]
\[x = 503.\]