-0,5x(2x-3)-(4x+3)(1-2x)=-(x-1.5)*x-(4x+3)*(1-2x)=-(x^2-1.5x)-(4x+3)*(1-2x)=-x^2+1.5x-(4x+3)*(1-2x)=-x^2+1.5x-(-2x-8x^2+3)=-x^2+1.5x+2x+8x^2-3=-x^2+3.5x+8x^2-3=7x^2+3.5x-3