5 1/3 + х = 7,5
х = 7,5 - 5 1/3
х = 7 5/10 - 5 1/3
х = 75/10 - 16/3
х = 225/30 - 160/30
х = 65/30
х = 13/6 = 2 1/6
6 3/7 - у = 4,2
у = 6 3/7 - 4,2
у = 6 3/7 - 4 2/10
у = 45/7 - 42/10
у = 450/70 - 294/70
у = 156/70
у = 2 16/70
m + 8 1/9 = 9,4
m = 9,4 - 8 1/9
m = 9 4/10 - 8 1/9
m = 94/10 - 73/9
m = 846/90 - 730/90
m = 116/90
m = 58/45 = 1 13/45
10 7/11 - n = 3,6
n = 10 7/11 - 3,6
n = 117/11 - 36/10
n = 1170/110 - 396/110
n = 747/110
n = 6 87/110