3)Решите уравнение х+2/13=3/26+5/13​

х + 2/13 = 3/26 + 5/13

(26х)/26 + 4/26 = 3/26 + 10/26

26х + 4 = 3 + 10

26х = 13 - 4

26х = 9

х = 9/26

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Проверка: 9/26 + 4/26 = 3/26 + 10/26

                   13/26 = 13/26