Antécédent par tableau des variations

Soit f une fonction définie sur [ -4;13 ] dont le tableau des variations est donné ci-dessous
x -4 3 5 13
f(x) 5 13 4 12
Trouver un antécédent de 13 par la fonction f :

Hint
This is exercise number 1 in a series of 7 exercises.
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