Urgent aider moi a resoudres les exercices 103 et 108

Exercice 103
1) 6-4(x-2) = 6-4x+8 = -4x + 14

2) (2x+3)(3x+5+x+5) = (2x+3)(4x+10)

3) G(5*-3+3)(4-2*-3) = (-15+3)(4+6) = -12*10 = -120