Tolong lah jawab ya saya udh lupa

Tolong lah jawab ya saya udh lupa

1. 12x-10 < 15x+2
= 12x – 15x < 2 + 10
= -3x < 12
= x > -4

2. 4(2x-5)+7 <= 14x +8
$8x - 20 + 7 leqslant 14x + 8 \ = 8x - 13leqslant 14x + 8 \ = 8x - 14x leqslant 8 + 13 \ = - 6x leqslant 21 \ = x geqslant frac{21}{ - 6} \ = x geqslant - frac{7}{2}$

3.
$frac{2}{3} x - 5 leqslant 7 \ = frac{2}{3} x leqslant 12 \ = x leqslant 12 div frac{2}{3} \ = x leqslant 12 times frac{3}{2} \ =x leqslant 18$

4.
$frac{2x}{5} - frac{9}{10} > frac{x}{2} \ = frac{4x}{10} - frac{9}{10} > frac{5x}{10} \ = frac{4x - 5x}{10} > frac{9}{10} \ = - frac{x}{10} > frac{9}{10} \ = - x > 9 \ = x < 9$

5. (4x+16)/20 + (5x-10)/20 leqslant (6x+14)/20
= (9x+6)/20 leqslant (6x+14)/20
= 9x+6 leqslant 6x+14
=9x-6x leqslant 14-6
=3x leqslant 8
=x leqslant 8/3
=x leqslant 2,667