Решение на прикреплённой фотографии

Пошаговое объяснение:

m + (-4 1/9) + 7 7/24 + n + (-7 5/9) + (-12 11/24) =

m - 4 1/9 + 7 7/24 + n - 7 5/9 - 12 11/24 =

(-4 1/9 - 7 5/9) + (7 7/24 - 12 11/24) + m + n =

-11 6/9 + (-5 4/24) + m + n =

-11 2/3 - 5 1/6 + m + n = -11 4/6 - 5 1/6 + m + n =

-16 5/6 + m + n

m = -4 1/6; n = -2 11/12

-16 5/6 + (-4 1/6) + (-2 11/12) =

-16 5/6 - 4 1/6 - 2 11/12 = -20 6/6 - 2 11/12 =

-21 - 2 11/12 = -23 11/12