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4² ≥ 3x-5
16 ≥ 3x-5
21 ≥ 3x
7 ≥ x
b.) ⁷ log (4x+3) < ⁷ log 15
⁷ log (4x+3) - ⁷ log 15 < 0
⁷ log 4x+3 < 0
15
7° < 4x+3
15
1 < 4x+3
15
15 < 4x+3
12 < 4x
3 < x