Sagot :
Réponse :
Bonjour
Explications étape par étape
a) 2 + 2x = 4
2x = -2 +4
2x = 2
x = 2/2 = 1
d) 5 - 3x = -15
-3x = -5 -15
-3x = -20
x = +20/3
b) - 7x + 4 = 3
-7x = -4 +3
-7x = -1
x = +1/7
e) x - 9 = 12x
-12x +x = 9
-11x = 9
x = 9/-11
[tex]bonjour\\\\\\2 + 2 x = 4 \\2 x = 4 - 2 \\2 x = 2 \\x = 1 \\\\\\5 - 3 x = - 15\\- 3 x = - 15 - 5 \\- 3 x = - 20 \\x = 20/3\\\\\\- 7 x + 4 = 3 \\- 7 x = 3 - 4 \\- 7 x = - 1 \\x = 1/7 \\\\\\x -9 = 12 x \\x - 12 x = 9 \\- 11 x = 9 \\x = - 9 /11 \\\\\\3/x = - 8 \\- 8 x = 3 \\x = - 3 /8 \\\\\\x /9 = 3 \\x = 27 \\\\[/tex]