Question

3 3/7x-(1 3/14x+8/21x); если х=24

Answer 1

3 3/7x - (1 3/14x + 8/21x) = 
24/7х - 17/14х - 8/21х = 
144/42х - 51/42х - 16/42х = 
77/42х = 11/6х = 1 5/6х,

при х = 24:  1 5/6 * 24 = 11/6 * 24 = 11 * 4 = 44