x+9 11/20=22 1/2-10 7/12

Х + 9 11/20 = 22 1/2 - 10 7/12
22 1/2 - 10 7/12 = 22 6/12 - 10 7/12 = 21 18/12 - 10 7/12 = 11 11/12
Х + 9 11/20 = 11 11/12
Х = 11 11/12 - 9 11/20
11 11/12 - 9 11/20 = 11 55/60 - 9 33/60 = 2 22/60 = 2 11/30
Х = 2 11/30

x+9 11/20=22 1/2-10 7/12
х+9 11/20=11 11/12
х=11 11/12-9 11/20
х=2 11/30