Решите 1 вариант номер 2.
3/7x+5/56x=21/56x+5/56x=26/56x=13/28x -2/3b+5/12b=-8/12b+5/12b=-3/12b=-1/4b -4/25a-2/5a=-4/25a-10/25a=-14/25a