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Sagot :

VINS

bonjour

( x - 7 ) * 3 = 9

3 x - 21 = 9

3 x = 9 + 21

3 x = 30

x = 10

Réponse :

Bonjour !

(x - 7)*3 = 9

3x - 21 = 9

3x -21 + 21 = 9 + 21

3x = 30

3x/3 = 30/3

x = 10

voilà !

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