Bonjour resoudre les equations: 5(x+4)= -2(3x-5) x/x+6=3/8 (2x+1)(3x+4)=(6x-7)(x+2) merci par avance

bonjour,

5 ( x + 4) = - 2 ( 3 x - 5 )

5 x + 20 = - 6 x + 10

5 x + 6 x = 10 - 20

11 x = - 10

x = - 10/11

x / ( x +6) = 3/8

3 x + 18 = 8 x

3 x - 8 x = - 18

- 5 x = - 18

x = 18/5

( 2 x + 1 ) ( 3 x + 4 ) = ( 6 x - 7 ) ( x + 2 )

6 x² + 8 x + 3 x + 4 = 6 x² + 12 x - 7 x - 14

6 x² - 6 x² + 11 x - 12 x + 7 x = - 14 - 4

6 x = - 18

x = - 3