Помогите решить уравнения: 1) 5 5/6 : 3 1/2 = х : 15

2) х : 16 = 3 3/4 : 6 2/3

3) -0,2х · ( -0,7 ) = 0,84

4) 1/3х + 2 2/5 = 3 2/5

Помогите!! Прошу!!!!
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