Réponse :
exercice 6
a. 2(x+5) = 3(2x-2) <=> 2x +10 = 6x -6 <=> 6x -2x = 10+6
<=> 4x = 16
<=> x = 16/4
<=> x =4
b. 2(x -2) - 4(1-x) = 4 <=> 2x -4 -4 +4x = 4 <=> 6x = 4 +8
<=> 6x = 12
<=> x = 2
c. 3(x-2) + 4 = 2-x <=> 3x -6 = 2-4 -x <=> 3x +x = -2 +6
<=> 4x = 4
<=> x = 1
d 5(x+1) = 3(3-x) <=> 5x + 5 = 9 -3x <=> 5x +3x = 9 - 5
<=> 8x = 4
<=> x = 4/8
<=> x = 1/2
j'espère avoir pu aidé.
Explications étape par étape
