Réponse :
bonjour,
(4+3x)/5 = (7x-1)/8
(4+3x)/5 - ( 7x - 1)/8 = 0
8(4+3x)/5×8 - 5(7x - 1)/8×5 = 0
(32 +24x) / 40 - (35x - 5)/40 = 0
(32 + 24x-35x + 5)/40 = 0
(-11x+37)/40 = 0
-11x + 37 = 0
-11x = -37
x = -37/-11
x = 37/11
(6-x)/3 = (4x+1)/2
(6-x)/3 - (4x+1)/2 = 0
2 (6-x) / 3×2 - 3(4x+1)/2×3 = 0
(12 - 2x)/6 - (12x +3)/6 = 0
(12 -2x -12x-3)/6 = 0
(-14x + 9 ) / 6 = 0
-14x + 9 = 0
-14x = -9
x = -9/-14
x = 9/14
voila :)
