6,2(3-2х) =20-(12,4+1,4)
6,2(3-2х) = 20-(12,4+1,4) 6,2 * (3-2х) = 6,2 3-2х = 1 2х = 2 х=1 Проверка: 6,2(3-2) = 20 -(12,4+1,4) 6,2=6,2 Ответ: х=1