Réponse :
Explications étape par étape
Bonjour
a) 3x - 1 = 0
3x = 1
x = 1/3
a) 2(3 + 2x) = 5x +.12
6 + 4x = 5x + 12
6 - 12 = 5x - 4x
-6 = x
x = -6
b) 2 - 3x = 0
3x = 2
x = 2/3
b) 3x – 4 = 5(x - 1)
3x - 4 = 5x - 5
-4 + 5 = 5x - 3x
1 = 2x
x = 1/2
c) 5 + 4x = 0
4x = -5
x = -5/4
c) 2(3y - 2) = -6y + 1
6y - 4 = -6y + 1
6y + 6y = 1 + 4
12y = 5
y = 5/12
d) 3x + 5 = -2
3x = -2 - 5
x = -7/3
e) 7x - 5 = 12
7x = 12 + 5
x = 17/7
f) 3x – 3 = 6x + 1
-3 - 1 = 6x - 3x
-4 = 3x
x = -4/3
d) 4(4y + 1) = 6(2y - 1)
16y + 4 = 12y - 6
16y - 12y = -6 - 4
4y = -10
y = -10/4
y = -5/2
e) 2(5x - 3) = 4(x – 5)
10x - 6 = 4x - 20
10x - 4x = -20 + 6
6x = -14
x = -14/6
x = -7/3
f) 3-2(x+2) = 2(x + 1)
3 - 2x - 4 = 2x + 2
-1 - 2 = 2x + 2x
-3 = 4x
x = -3/4
g) x + 3(x - 1) = 2x - 3
x + 3x - 3 = 2x - 3
4x - 2x = -3 + 3
2x = 0
x = 0
h) 7x-(5x + 3) = 5(x-3)+2
7x - 5x - 3 = 5x - 15 + 2
2x - 3 = -13 + 5x
13 - 3 = 15x - 2x
10 = 13x
x = 10/13
i) 7(x + 2) - 3 = 25-(3x + 4)
7x + 14 - 3 = 25 - 3x - 4
7x + 3x = -11 + 21
10x = 10
x = 10/10
x = 1
g) 3 - 6x = 15x + 16
3 - 16 = 15x + 6x
-13 = 21x
x = -13/21
h) 5x + 1 =-3x +11
5x + 3x = 11 - 1
8x = 10
x = 10/8
x = 5/4
i) 5 - 2x = 5x + 5
5 - 5 = 5x + 2x
0 = 7x
x = 0
j) 4y + 3(4y - 2) = 3(y + 1)
4y + 12y - 6 = 3y + 3
16y - 3y = 6 + 3
13y = 9
y = 9/13
j) -3x – 1 = 8 - 2x
-1 - 8 = 3x - 2x
x = -9
