Réponse :
Explications étape par étape :
a)2(x+9)=4x 2x +18 = 4x 2x-4x = -18 on obtient -2x =-18 x = -18/-2 donc x = 9
b)5(x-2) = 4x +9 => 5x -10 = 4x +9 => 5x-4x = 10+9 => x =19
c)4(x+5) =10(x-3) => 4x +20 = 10x -30 => 4x -10x = -20-30 => -6x = -50 => x = 50/6 on obtient x = 25/3
a)x/2 +5 = 9 => x/2 = -5+9 => x/2 =4 on obtient x = 8
b)x+2/3 =2x-1/3 => x -2x = -2/3 – 1/3 => -x = -3/3 on obtient x = 1
c)4x/3 -3/5 = 3x +1/2 => 4x/3 – 3x = 3/5+1/2 => (4x -9x)/3 = (6 +5)/10 => -5x/3 = 11/10
on obtient x = -33/50
