Répondre :
Exercice 21:
a) 5x + 3 = 2x + 6
-2x + 5x = 6 - 3
3x = 3
3x/3 = 3/3
x = 1
b) 3x - 4 = -4x + 17
4x + 3x = 17 + 4
7x = 21
7x/7 = 21/7
x = 3
c) 2x - 2 = 3x + 11
-3x + 2x = 11 + 2
x = 13
d) 3x + 1 = -2x + 11
2x + 3x = 11 - 1
5x = 10
5x/5 = 10/5
x = 2
Exercice 23:
a) 3x - 1 = 2x + 1
-2 + 3x = 1 + 1
x = 2
b) 2x - 1 = 4x - 7
7 - 1 = 4x - 2x
6 = 2x
6/2 = 2x/2
3 = x
c) 5x + 6 = 2x + 9
-2x + 5x = 9 - 6
3x = 3
3x/3 = 3/3
x = 1
d) 3x + 1 = 4x + 4
-4 + 1 = 4x - 3x
-3 = x
a) 5x + 3 = 2x + 6
-2x + 5x = 6 - 3
3x = 3
3x/3 = 3/3
x = 1
b) 3x - 4 = -4x + 17
4x + 3x = 17 + 4
7x = 21
7x/7 = 21/7
x = 3
c) 2x - 2 = 3x + 11
-3x + 2x = 11 + 2
x = 13
d) 3x + 1 = -2x + 11
2x + 3x = 11 - 1
5x = 10
5x/5 = 10/5
x = 2
Exercice 23:
a) 3x - 1 = 2x + 1
-2 + 3x = 1 + 1
x = 2
b) 2x - 1 = 4x - 7
7 - 1 = 4x - 2x
6 = 2x
6/2 = 2x/2
3 = x
c) 5x + 6 = 2x + 9
-2x + 5x = 9 - 6
3x = 3
3x/3 = 3/3
x = 1
d) 3x + 1 = 4x + 4
-4 + 1 = 4x - 3x
-3 = x
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