S=ab
S=25*8=200 мм2..........................................
-12,7 + (х - 5,3) = 0
-12,7 + х - 5,3 = 0
х = 0 + 5,3 + 12,7
х = 18
(x- 1 8/9 ) + 3 7/9 = 4 4/9
x - 1 8/9 + 3 7/9 = 4 4/9
x=4 4/9 + 1 8/9 - 3 7/9
x= 40/9 + 17/9 - 34/9
x=57/9 - 34/9
x= 23/9
x= 2 5/9
Ответ: х= 2 5/9