Usuń nawiasy i zredukuj wyrazy podobne (7-4b+3a)-(2a+4b-7)= -(3x+2y+z)+(4x-3z-3y)+(-2y-3z+x)= (3x+8y+z)-(4x+3y-2z)-(-2x+5y-5z)= (2x^2+3x+4)-(-7+4x-3x^2)-(x^2-5x+2)= (x^3+4x-2)+(-2x^3-3x+4)= Dam naj!!!

[latex](7-4b+3a)-(2a+4b-7)=7-4b+3a-2a-4b+7=a-8b+14\\ -(3x+2y+z)+(4x-3z-3y)+(-2y-3z+x)=\ =-3x-2y-z+4x-3z-3y-2y-3z+x=\ =2x-7y-7z\\ (2x^2+3x+4)-(-7+4x-3x^2)-(x^2-5x+2)=\ =2x^2+3x+4+7-4x+3x^2-x^2+5x+2=\ =4x^2+4x+13\\ (x^3+4x-2)+(-2x^3-3x+4)=x^3+4x-2-2x^3-3x+4=\ =-x^3+x+2[/latex] [latex](3x+8y+z)-(4x+3y-2z)-(-2x+5y-5z)=\ =3x+8y+z-4x-3y+2z+2x-5y+5z=\ =x+8z[/latex]