9 5/11 : ( - 8 5/13 - Y) = 1 48/121
- 8 5/13 - Y = 9 5/11 : 1 48/121
- 8 5/13 - Y = 104/11 : 169/121
- 8 5/13 - Y = 104/11 * 121/169
- 8 5/13 - Y = 1144/169
Y = - 8 5/13 - 1144/169
Y = - 8 65/169 - 1144/169
Y = - 8 65/169 - 6 130/169
Y = - 14 195/169
Y = - 15 26/169
Y = - 15 2/13
Ответ : Y = - 15 целых 2/13
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15 - 6,8 * ( 5X - 10,5) = 1/2 * ( 19,8 - 14X )
15 - 34X + 71,4 = 9,9 - 7X
86,4 - 34X = 9,9 - 7X
34X - 7X = 86,4 - 9,9
27X = 76,5
X = 153/2 : 27
X = 153/54
X = 2 45/54
X = 2 5/6
Ответ Х = 2 целых 5/6