решить пример (3/8÷21/32-3/5:3)*5/6

(3/8÷21/32-3/5:3)*5/6= (3/8*32/21-3/5*1/3)*5/6= (4/7-1/5)*5/6= (20/35-7/35)*5/6= 13/35*5/6=13/42