\[\boxed{\mathbf{3.}\mathbf{282}}\]
\[\textbf{а)}\ 10x - 9x + 10 = 13\]
\[x = 13 - 10\]
\[x = 3.\]
\[\textbf{б)}\ 11y + 18y - 46 = 70\]
\[29y = 70 + 46\]
\[29y = 116\]
\[y = 116\ :29\]
\[y = 4.\]
\[\textbf{в)}\ 4z - 3z + 25 = 42\]
\[z = 42 - 25\]
\[z = 17.\]
\[\textbf{г)}\ 5p + 6p - 77 = 0\]
\[11p = 77\]
\[p = 77\ :11\]
\[p = 7.\ \]