Помогите срочно..........
(7х - 99) / 10 = - 5 7х - 99 = - 5 * 10 7х - 99 = - 50 7х = - 50 + 99 7х = 49 х= 49 : 7 х=7 =================== (7 * 7 - 99) / 10 = - 5 -50/10 = -5 -5=-5