72=60+12
72=36+36
72=16+56
16 1/5 - 1 4/15 = 16 3/15 - 1 4/15 = 15 18/15 - 1 4/15 = 14 14/15
-3х+3 = 24 -10х
-3х +10 х =24-3
7х = 21
Х = 3