- 20X + 260 = - 220 - 20X = - 480 X = 24 Проверка- 480 + 260 = - 220- 220 = - 220 --------------------240 - 56X = 352 - 56X = 112 X = - 2 Проверка:- 112 = - 112 -----------------5Y - 9 = 6 5Y = 15 Y = 3 Проверка:15 - 9 = 66 = 6----------10,36 - 0,37X = 7,4 10,36 - 7,4 = 0,37X 2,96 = 0,37X X = 8Проверка:10,36 - 2,96 = 7,47,4 = 7,4-----------( 3X - 1,2) * 7 = 10,5 3X - 1,2 = 1,53X = 2,7X = 0,9Проверка( 2,7 - 1,2) * 7 = 10,51,5 * 7 = 10,5 10,5 = 10,5 --------------1/3 X + 5/6 X - 1 = 1 / 1/3 2/6 X + 5/6 X - 1 = 3 7/6 X = 4 X = 4 : 7/6 X = 24/7 X = 3 3/7 Проверка:1/3 * 24/7 + 5/6 * 24/7 - 1 = 1 / 1/3 24/21 + 20/7 - 1 = 3 24/21 + 60/21 = 4 84/21 = 4 4 = 4