bagai manakah no 43 beserta cara

3x + 15/4 < 4x + 5
-------------------------- × 4
12x + 15 < 16x + 20
12x - 16x < 20 - 15
-4x < 5
---------- ÷-4
x > -5/4
4x + 5 ≤ 3x + 9
4x - 3x ≤ 9 - 5
x ≤ 4
-5/4 < x ≤ 4
{-1, 0, 1, 2, 3, 4}
ada 6 bilangan