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x x
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9 3
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9 9
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x x x x
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) ( 1)( 2) 0
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a x
b x x
c x x
d x x x
e x x x x
+ =
− − =
+ − =
+ − − =
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1x = −
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1
1;
3
x x= = −
1 2
1; 2x x= − =
1 2 3
1
1; 1;
3
x x x= − = = −
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