{5+1/3+[8.7-(3+1/2)*(2+1/7)]}/(19+3/5)={5+1/3+[8.7-7/2*15/7]}/(19+3/5)={5+1/3+[8.7-15/2]}/(19+3/5)={5+1/3+[8.7-7.5]}/(19+3/5)={5+1/3+1.2}/(19+3/5)={5+1/3+1+1/5}/(19+3/5)={6+1/3+1/5}/(19+3/5)={6+5/15+3...