tolong kerjain yaaaaaa

2 ) -3 + [7+(-1x3)] + 7 - 20
= -3 + 4 + 7 - 20
= 8 - 20
= -12 (a)

3 ) 2x - 5 = 7
2x = 7 + 5
2x = 12
x = 6 (b)

4 ) 4x + 2 = x - 4
4x - x = -4 - 2
3x = -6
x = -2 (d)

5 ) 3x + 2 = x - 4
3x - x = -4 - 2
2x = -6
x = -3 (c)

6 ) 7 - x - x²
= 7 - (-2) - (-2)²
= 7 + 2 + 4
= 13 (d)

7 ) 2 - x³
= 2 - (-2)³
= 2 + 8
= 10 (b)

8 ) c

9 ) a

12 ) 5 + px = -7
5 + p.-3 = -7
5 - 3p = -7
-3p = -7 - 5
-3p = -12
p = 4 (d)

13 ) ayah + ibu + anak = 123 tahun
ibu = 48 tahun

ayah + anak = 75 tahun

75 = 2 anak + anak
75 = 3 anak
25 = 1 anak (c)

15 ) 28 x 3/7 = 12 (b)

16 ) x² = 16
x = √16
x = 4(b)