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3y - 4y ≥ 5
- y ≥ 5
y ≤ - 5
2) 3(2n - 1) < 4(2n + 3)
6n - 3 < 8n + 12
6n - 8n < 12 + 3
- 2n < 15
2n > - 15
n > - 15/2
3) 2 (4 - 3n) ≤ 4 (n - 5)
8 - 6n ≤ 4n - 20
- 6n - 4n ≤ - 20 - 8
- 10n ≤ - 28
10n ≥ 28
n ≥ 28/10
n ≥ 14/5