Помогите решить :

1. 5/6 - 0,4 =
2. - 0,6 : (-3/25) =
3. 20 - 18,6 : (6 11/15 - 4 3/20) =
5. уравнение : 1/6х - 0,82 = 3/8х - 1,37
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