Помогите пожалуйста

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