17x-8=-7x-2  ;-4x-21=3x+7   ;-3x+11=8x-9   ;7x+3=9x-7

Bonjour,

[tex]17x-8 = -7x-2\\ 24x = 6\\ x = \frac{6}{24} = \frac 14[/tex]

[tex]-4x-21 = 3x+7\\ -7x = 28\\ x = -4[/tex]

[tex]-3x+11 = 8x-9\\ -11x = -20\\ x = \frac{20}{11}[/tex]

[tex]7x+3 = 9x-7\\ -2x = -10\\ x = 5[/tex]