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|7x-16| =21va rog datimi un ajutor


Răspuns :

|7x-16|=21

Caz 1:

7x-16=21

7x=21+16

7x=37

x=37/7

Caz 2:

7x-16=-21

7x=-21+16

7x=-5

x=-5/7

x∈{-5/7;37/7}

succes===============================

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