Помогите решить уравнения:

1) 5 5/6 : 3 1/2 = х: 15

2) х: 16 = 3 3/4 : 6 2/3

3) - 0,2 х · (-0,7) = 0,84

4) 1/3 х + 2 2/5 = 3 2/5

Помогите! Прошу!

1) 5 5/6 : 3 1/2 = x/15

25/6 : 3/2 = x/15

25/9 = x/15

375 = 9x

x = 125/3 = 41 2/3

2) x/16 = 3 3/4 : 6 2/3

x/16 = 9/4 : 2*2

x/16 = 9/16

x = 9

3) - 0,2x * (-0,7) = 0.84

0.14x = 0.84

x = 6

4) 1/3x + 2 2/5 = 3 2/5

1/3x + 4/5 = 6/5

5x + 12 = 18

5x = 18 - 12

5x = 6

x = 6/5 = 1 1/5 = 1.2