решите уравнение
5c-1/2 +2c-2/7=13c+9/6

5c + 2c - 13c = 9/6 +2/7 + 1/2-6c = 63/42 + 12/42 + 21/42-6c = 96/42-6c = 16/7c = 16/7 : (-6)c = 16/7 * (-1/6)c = - 8/21