Antécédent par tableau des variations

Soit f une fonction définie sur [ 6;33 ] dont le tableau des variations est donné ci-dessous
x 6 13 23 33
f(x) 23 21 29 25
Trouver un antécédent de 23 par la fonction f :


Hint
This is exercise number 1 in a series of 8 exercises.
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