tolong bantu ya soal nomor 4

* 2a+(-a) = -2
a = -2
* -3b+b = 6
-2b = 6
b = -3
* c+(-5) = -3
C= -3+5
C = 2
* a+b+c = -2 + (-3) + 2
= -5+2
= -3
Jadi , jawabannya C