Urgent merci !! Résoudre les équations suivante 1) 7x = 9 2) -7x = 9 3) x/7 = 9 4) 2x+7 = 9

Salut,

7x = 9 <=> x = 9/7
-7x = 9 <=> x = -9/7
x / 7 = 9 <=> x = 7*9 = 63
2x + 7 = 9 <=> 2x = 9 -7 <=> 2x = 2 <=> x = 1

Bonne soirée !