\[\boxed{\mathbf{4.36}}\]
\[\textbf{а)}\ (6x + 2x) \cdot 17 = 136\]
\[8x = 136\ :17\]
\[8x = 8\]
\[x = 1.\]
\[\textbf{б)}\ (9y - 4y)\ :17 = 10\]
\[5y = 10 \cdot 17\]
\[5y = 170\]
\[y = 170\ :5\]
\[y = 34.\]
\[\textbf{в)}\ (9a + a)\ :13 = 20\]
\[10a = 20 \cdot 13\]
\[10a = 260\]
\[a = 260\ :10\]
\[a = 26.\]
\[\textbf{г)}\ 132\ :(12b - b) = 4\]
\[11b = 132\ :4\]
\[11b = 33\]
\[b = 33\ :11\]
\[b = 3.\ \]