1. sederhanakan 6a – 3d + 56 + 7a + 4d – 7c 2. 2x – 12 = 14 – 4x 3. 1/3 komplemen = … ?

1. 6a – 3d + 56 + 7a + 4d – 7c
= 13a – 7c + d + 56

2. 2x – 12 = 14 – 4x
2x + 4x = 14 + 12
6x = 26
x = 26/6
x = 13/3
x = 4 1/3