Tentukan himpunan penyelesaian dari persamaan:

1) 2 (2x-1) + 3 (2x+3) = 15
4x – 2 + 6x + 9 = 15
4x + 6x -2 + 9 = 15
10x + 7 = 15
10x = 15 – 7
10x = 8
x = 8/10
= 4/5
= 0,8

2) 5x + 2/3 – 3x – 2/2 = 1
5x – 3x + 2/3 – 2/2 = 1
2x – 2/6 = 1
2x = 1 + 2/6
2x = 8/6
x = 8/6 : 2
= 8/12
= 2/3

3) 3(2x-1) < 2x+9
6x – 3 < 2x+9
6x – 2x < 9+3
4x < 12
x < 12/4
x < 3