\[\boxed{\mathbf{2.}\mathbf{127}}\]
\[\textbf{а)}\ (z + 25,3) \cdot 4,3 = 160,82\]
\[z + 25,3 = 160,82\ :4,3\]
\[z + 25,3 = 37,4\]
\[z = 37,4 - 25,3\]
\[z = 12,1.\ \]
\[\textbf{б)}\ (y - 0,86) \cdot 0,05 = 0,0285\]
\[y - 0,86 = 0,0285\ :0,05\]
\[y - 0,86 = 0,57\]
\[y = 0,57 + 0,86\]
\[y = 1,43.\]
\[\textbf{в)}\ (m + 41,1)\ :17,1 = 4,3\]
\[m + 41,1 = 4,3 \cdot 17,1\]
\[m + 41,1 = 73,53\]
\[m = 73,53 - 41,1\]
\[m = 32,43.\]
\[\textbf{г)}\ (n - 8,7)\ :18,7 = 5,2\]
\[n - 8,7 = 5,2 \cdot 18,7\]
\[n - 8,7 = 97,24\]
\[n = 97,24 + 8,7\]
\[n = 105,94.\]