please djwb secepatx yah,... poinnya tggi lho

1.18 + 6 - 4 = 20
    ket :
   18 + 6 = 24 - 4 = 20

2. 6 + 10 + 6 = 22
    ket :
    6 + 10 = 16 + 6 = 22

3. 24 - 6 - 6 = 12
    ket :
    24 - 6 = 18 - 6 = 12

4. 6

Bab Bilangan Bulat
Matematika SMP Kelas VII

Misal, gambar = a

1] 18 + a - 4 = 20
a = 20 - 14
a = 6

2] a + 10 + a = 22
2a = 22 - 10
a = 12 : 2
a = 6

3] 24 - a - a = 12
-2a = 12 - 24
a = -12 : -2
a = 6