36:9=4 (см)- ширина прямоугольника
S:а=b -формула
(2/7:3/7 + (4 1/2-3 5/6) * (6 1/2:9) = 4 1/2 - 3 5/6 = 2/3
2/7 : 3/7 = 14/21
14/21 + 2/3 * 3 1/3 = 14/21 + 2/3 = 1 1/3 * 3 1/3 = 4 2/3
6 1/2 : 9 = 15 1/2
4 2/3 : 15 1/2 = 28/93
|x-1|+|5-x|=18
|x-1|+|5-x|=|x-1|+|5-x|
|x-1|+|5-x|=2*9
x=-6
x=12