tolong bantu saya untuk menjawab soal no. 2 dong broo (pake cara ya..)

Bab Matriks
Matematika SMA Kelas X

a + 4 = 3a
4 = 3a - a
4 = 2a
a = 4 : 2
a = 2

6 + a + b = 3b
6 + 2 + b = 3b
8 = 3b - b
8 = 2b
b = 4

2d + 3 = 3d
3 = 3d - 2d
d = 3

-1 + c + d = 3c
-1 + 3 = 3c - c
2 = 2c
c = 1

Jadi, a = 2; b = 4; c = 1; d = 3

Jawabannya E