1/3 (5/12-4m)=4/9 (3/2m-3/8)
1/3*5/12 - 1/3*4м = 4/9 * 3/2м-4/9*3/8 20/12-м=5/6м-м -м+м-5/6м=-20/12 -5/6м=-20/12 5/6м=20/12 м=20/12 / 5/6 м=4