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5 (x +5) < 7 (x-7)
5x +25 < 7x -49
25 +49 < 7x -5x
74 < 2x
x > 74/2
x > 37
b). gak terlalu jelas saya lihat soalnya
2. gak ngerti
4. gaj begitu yakin
5. a) \frac{2}{ x^{2} -1} \leq \frac{3}{x+1}
2 (x+1) ≤ 3 ( x^{2} -1)
2x + 2 ≤ 3x^{2} - 3
0 ≤
3 x^{2} -2x-5 ≥ 0
( 3x -5) (x+1) ≥ 0
3x -5 ≥ 0 ∨ x+1 ≥0
x ≥ 5/3 x ≥ -1
hp:{x| -1 ≤ x ∨ x≥5/3}