E=(2x-3)(x+2)-5(2x-3) developper et réduireE factoriser E aider moi merci beaucoup

2x*x+2x*2+(-3)*x+(-3)*2-5*2x-5*(-3)
3x+2x*2+(-3x)+(-5)-5*2x-15
10x*7

re bonsoir :)
developper E= (2x-3)(x-+2)-5(2x-3)
                     = 2x + 4x -3x -6 -10x+15
                     = -7x+9