a + b + c = 3 5a – 9b – 2c = 8 3a + 5b – 3c = 45

a + b + c = 3 |×2
5a - 9b - 2c = 8
maka
2a + 2b + 2c = 6
5a - 9b - 2c = 8
-------------------------(+)
7a - 7b = 14 ... pers 1

a + b + c = 3 |×3
3a + 5b - 3c = 45
maka
3a + 3b + 3c = 9
3a + 5b - 3c = 45
--------------------------(+)
6a + 8b = 54 ... pers 2

pers 1 & 2
7a - 7b = 14 |×6
6a + 8b = 54 |×7
maka
42a - 42b = 84
42a + 56b = 378
------------------------(-)
- 98b = - 294
b = 3

subtitusi
7a - 7b = 14
7a - 7(3) = 14
7a - 21 = 14
7a = 14 + 21
7a = 35
a = 5

subtitusi
a + b + c = 3
5 + 3 + c = 3
8 + c = 3
c = 3 - 8
c = - 5

hp = ( 5, 3 , - 5 )