Verified answer

Bonjour aussi :(

8x - 7 = 5x + 20

8x = 5x + 27

3x = 27

3x/3 = 27/3

x = 9

bonjour ??

il faut isoler x..

8x - 7 + 7 = 5x + 20 + 7

8x = 5x + 27

8x - 5x = 5x - 5x + 27

3x =  27

x = 27/3

x = 9

on a bien 8 * 9 - 7 = 72 - 7 = 65

et  5 * 9  + 20 = 45 + 20 = 65