7(-5 + 3x) + 4x = 9,
-35 + 21x + 4x = 9,
25x = 9 + 35,
25x = 44,
x = 44/25,
x = 1 19/25.
Ответ: 1 19/25.
7(-5 + 3x) + 4x = 9,
-35 + 21x + 4x = 9,
25x = 9 + 35,
25x = 44,
x = 44/25,
x = 1 19/25.
Ответ: 1 19/25.