21 – x = 56
– x = – 21 + 56
– x = 35
x = – 35
y-69=90
y=90+69
у=159
(24 – x) – 21 = 10
24 – x – 21 = 10
– x = – 24 + 21 + 10
– x = 7
Ответ: x = – 7
21 – x = 56
– x = – 21 + 56
– x = 35
x = – 35
y-69=90
y=90+69
у=159
(24 – x) – 21 = 10
24 – x – 21 = 10
– x = – 24 + 21 + 10
– x = 7
Ответ: x = – 7