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Sagot :

-7/p = 4/13
1/p=(4/13):7
1/p=4/13*1/7
1/p=4/91
p=91/4
-7/p=4/13
-1/p=4/13 : 7
-1/p=4/13 x 1/7
-1/p= 4/91
-p=91/4
p=-91/4

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