\[\boxed{\mathbf{1094\ (1085)}\mathbf{.}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[1) - 4a + 12a + 13a -\]
\[- 27a = - 6a\]
\[2)\ 4,2x - 4,8x - 6,3x -\]
\[- 2,4x = - 9,3x\]
\[3) - + 19y - 15y + =\]
\[= - 4x + 4y\]
\[4)\ - 0,8m - 0,7m +\]
\[+ - = 2,5n - 1,5m\]