(7-у)=-2
7-у=-2
-у= -2-7
-у= -14 | :(-1)
у=14
ответ: 14
(7-y) = -2
7-y = -2
y = 7-(-2(
y = 9 П: 7-9 = -2
(7-у)=-2
7-у=-2
-у= -2-7
-у= -14 | :(-1)
у=14
ответ: 14
(7-y) = -2
7-y = -2
y = 7-(-2(
y = 9 П: 7-9 = -2