Tentukan penyelesaian dari persamaan dan pertidaksamaan berikut:

1.
4x + 18 = 6 – 2x
4x + 2x = 6 – 18
6x = -12
x = -2

2.
4(2y – 3) = 4y + 10
8y – 12 = 4y + 10
8y – 4y = 10 + 12
4y = 22
y = 22/4 = 11/2 = 5 ½

3.
4(2y + 3) – 2y = 3(4y + 3)
8y + 12 – 2y = 12y + 9
12y – 8y + 2y = 12 – 9
6y = 3
y = 3/6 = ½

4.
⅔(2y – 3) = ½(4y + 2)
4/3 y – 2 = 2y + 1
2y – 4/3 y = -2 – 1
6/3 y – 4/3 y = -3
⅔ y = -3
y = -9/2 = -4 ½

5.
2y – 5/4 + 7/12 = 4y – ⅓
4y – 2y = ⅓ – 5/4 + 7/12
2y = 4/12 – 15/12 + 7/12
2y = -4/12
y = -4/24 = -1/6