1) 4,14 a +8,73 a + 5,8 a - a =
2) x+y-x-y+4 =
3) 5-a+4a-b-6a =
4) 1,2c + 1 - 0,6 y -0,8 -0,2c =


Уже 1 час думаю всё забыл помогите
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