A+2b+2c=53a-b+2c=-42a+b-c=15​

A + 2b + 2c = 5

3a – b + 2c = – 4

————————(-)

– 2a + 3b = 9

a + 2b + 2c = 5

2a + b – c = 15 |×2

a + 2b + 2c = 5

4a + 2b – 2c = 30

————————-(+)

5a + 4b = 35

– 2a + 3b = 9 |×5

5a + 4b = 35 |×2

– 10a + 15b = 45

10a + 8b = 70

———————(+)

23b = 115

b = 5

– 2a + 3b = 9

– 2a + 3(5) = 9

– 2a = 9 – 15

– 2a = – 6

a = 3

a + 2b + 2c = 5

3 + 2(5) + 2c = 5

3 + 10 + 2c = 5

2c = 5 – 13

2c = – 8

c = – 4

hp = {3,5,-4}

maaf kalo salah:)