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maka: f(-3)=-3p+q=4
f(-5)=-5p+q=6
lalu di eliminasi
-3p+q=4 dikurang -5p+q=6
menjadi: 2p=-2
p=-1
lalu cari q:
-3p+q=4
-3(-1)+q=4
3+q=4
q=1
ditanya:
p-q= -1-1
= -2