А)
65 * (4 7/13m - 2 3/5m) = 9,
m*(59/13 - 13/5) = 9 : 65.
m * (295/65 - 169/65) = 9/65.
m * 126/65 = 9/65.
m = 9/65 : 126/65.
m = 9/65 * 65/126.
m = 9/126.
m = 1/14.
b)
(3 4/27n - 2 1/9n) * 54 = 22.
n * (85/27 - 19/9) = 22 : 54.
n * (85/27 - 57/27) = 22/54.
n * 28/27 = 22/54.
n = 22/54 : 28/27.
n = 22/54 * 27/28.
n = 11/28