1) (2 3/8 -х) / 3 1/4 + 2 13/15 = 3 1/6
(19/8 - х) / 13/4 + 43/15 = 19/6 19/26 - 4/13 *х + 43/15 = 19/6
19/26 +43/15 -19/6 = 4/13* х 285/390 + 598/390 - 1235/390 =4/13 * х
-352/390 = 4/13 *х х = -44/15 = -2 14/15
2) 4 1/2 - 5 1/3 / (20х -14 2/3) = 1 5/6 9/2 -16/3 / (20х -44/3) = 11/6
16/3 / (20х -44/3) = 11/6 - 9/2 16/3 / (20х -44/3) = - 16/6 , разделим правую и левую часть уравнения на 16/6 2 /(20х - 44 /3) = -1 2 = -20х +44/3
20х = 44/3 -2 20х =44/3 - 6/3 20х = 38/3 60х = 38 х = 38/60 х = 19/30
Как-то так :D