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X=1
X=-2
2x+py=4
2.1+p.-2=4
2-2p=4
-2p=4-2
-2p=2
P=-1
Px+qy=5
-1.1+q.-2=5
-1-2q=5
-2q=5+1
-2q=6
q=-3
p-q=-1-(-3)
=-1+3
=2
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