Réponse :
A. x = 1,5 B. x = 2/3 C. x = -10/3 D. x = 3,8
Explications étape par étape :
A. 4x+3 = 9 B. 3x+5 = 7 C. 5x+3 = 2x-7
4x = 9-3 3x = 7-5 5x-2x = -7-3
x = (9-3)/4 x = (7-5)/3 (5-2)x = -10
x = 6/4 x = 2/3 3x = -10
x = (2*3)/(2*2) x = -10/3
x = 3/2
x = 1,5
D. 2x-3/5 = 7
2x = 7+3/5
2x = (7*5)/5+3/5
2x = (35/5)+(3/5)
2x = (35+3)/5
2x = 38/5
x = 38/(5*2)
x = 38/10
x = 3,8
