(7-2 2/5×1 7/8 ) ÷ 5 5/8= помогите пожалуйста

(7-2*2/5 * 1*7/8) / 5*5/8 = (7 - 12/5 * 15/8) / 45/8 = (7-180/40) / 45/8 = ( 7/7 - 180/40) / 45/8 = ( (280-1260)/280 ) / 45/8 = -7/2 * 8/45 = -56/90 = -28/45.