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2p-q =-18 ×3
6p+8q=-32
6p-3q=-54 _
11q=22
q=22/11
q=2
substitusi
3p+4q=-16
3p+4(2)=-16
3p+8=-16
3p=-16-8
p=-24/3
p=-8
p+q
-8+2=-6