3(x-2)(x+1)-2(x-5)(x-3)怎么算？过程要详细

3(x-2)(x+1)-2(x-5)(x-3)
=3(x²-x-2)-2(x²-8x+15)
=3x²-3x-6-2x²纤亮世+16x-30
=x²毁肢键穗+13x-36