[math][(-1/3+5/7-1/2)xx21/20-1/4]xx(-1+1/11)xx{4/5-[1-(-2-3/5)]-(-1+2/5)}[/math]
[math][(-14+30-21)/42xx21/20-1/4]xx(-11+1)/11xx{4/5-[1-(-10-3)/5]-(-5+2)/5}[/math]
[math][-5/42xx21/20-1/4]xx-10/11xx{4/5-[1+13/5]+3/5}[/math]
[math][-1/8-1/4]xx-10/11xx{4/5-18/5+3/5}[/math]
[math]-3/8xx-10/11xx{(-18+4+3)/5}[/math]
[math]+15/44xx(-11/5)[/math]
[math]-3/4[/math]
