21x - 9 - 21x + 49 ≤ 5 - 2x
-9 + 49 ≤ 5 - 2x
40 ≤ 5 - 2x
2x ≤ 5 - 40
2x ≤ -35
x ≤ -35/2
Ответ: x ≤ -17.5
21x - 9 - 21x + 49 ≤ 5 - 2x
-9 + 49 ≤ 5 - 2x
40 ≤ 5 - 2x
2x ≤ 5 - 40
2x ≤ -35
x ≤ -35/2
Ответ: x ≤ -17.5