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3p - q=-5 ×1
3p+6q=9
3p - q =-5 dikurangi
7q=14
q=14÷7
q=2
p+2q=3
p+2.2=3
p+4=3
p= -1
3p-q=-5 x2 > 6p+2q=-10
p=-1 dan q=2
Hp={-1,2}