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20 + 5 ≤ 3x - 5 + 5 ≤ 40 + 5
25 ≤ 3x ≤ 45
25/3 ≤ x ≤ 45/3
25/3 ≤ x ≤ 15
2) 13 < 20 - 15t < 15
13 - 20 < 20 - 20 - 15t < 15 - 20
-7 < -15t < -5
-7/(-15) < -15t/(-15) < -5/(-15)
7/15 > t > 1/3
3) 1/8(x - 5) ≥ 5 + 8x/6
x/8 - 5/8 ≥ 5 + 8x/6
x/8 - 8x/6 ≥ 5 - 5/8
3x/24 - 32x/24 ≥ 40/8 - 5/8
-30x/24 ≥ 35/8 (x 24)
-30x ≥ 103
x ≤ 103/(-30)
x ≤ -103/30