\[\boxed{\mathbf{1303}\mathbf{\ (892)}.\ Еуроки\ - \ ДЗ\ без\ мороки}\]
\[1)\ (x - 50,6) + 2,15 = 42,9\]
\[x - 50,6 = 42,9 - 2,15\]
\[x = 40,75 + 50,6\]
\[x = 91,35\]
\[Ответ:91,35.\]
\[2)\ 31,28 - (m + 4,2) = 15,093\]
\[m + 4,2 = 31,28 - 15,093\]
\[m = 16,187 - 4,2\]
\[m = 11,987\]
\[Ответ:11,987.\]