\[\boxed{\mathbf{3.}\mathbf{98}}\]
\[\textbf{а)}\ (x - 14) \cdot 7 = 35\]
\[x - 14 = 35\ :7\]
\[x = 5 + 14\]
\[x = 19.\]
\[\textbf{б)}\ 22 \cdot (z + 6) = 308\]
\[z + 6 = 308\ :22\]
\[z = 14 - 6\]
\[z = 8.\]
\[\textbf{в)}\ (y + 34)\ :6 = 17\]
\[y + 34 = 17 \cdot 6\]
\[y = 102 - 34\]
\[y = 68.\]
\[\textbf{г)}\ 144\ :(y - 7) = 36\]
\[y - 7 = 144\ :36\]
\[y = 4 + 7\]
\[y = 11.\]