Помогите решить пожалуйста Математика 6 класс

1
0,3(1,2x-0,5y)-1,5(0,4x+y)
0,36x-0,15y-0,6x-1,5y=
-0,24x-1,65y

2
-2,4(2,5a-1,5b)+0,5(1,8b+5,6a)=
-6a+3,6b+0,9b+2,8a=
-3,2a+4,5b

3
-1,8(3,5m-5)-6,5(0,8-0,4m)=
-6,3m+9-5,2+2,6m=
-3,7m+3,8

4
4/9(1 1/2c-3/8)-(1 5/6-1 1/3c)=
4/9(3/2c-3/8)-(11/6-4/3c)=
2/3c-1/6-11/6-4/3c=
-2/3c-2

5
1,2(5/6k+0,4n)-1,8(5/9k-0,3n)=
12/10*5/6k+0,48n-18/10*5/9k+0,54n=
=k+0,48n-k+0,54n=1,02n

6
(1/6a+6,5)-(2 7/9a+3 1/3)=
1/6a+6,5-25/9a-10/3=
3/18a-50/18a+195/30-100/30=
-47/18a+95/30=2 11/18a+3 1/6

7
3/7(0,56x-4,9y)-6/13(0,52x-3,9y)=
3/7*56/100x-3/7*49/100y
-6/13*52/100x+6/13*39/100y=
3/1*8/100x-3/1*7/100y
-6/1*4/100x+6/1*3/100y=
0,24x-0,21y-0,24x+0,18y=-0,03y

8
6(1/4k-5/6)-15(0,6-2 1/3k)
1,5k-5-9+15*7/3k=
1,5k-14+35k=36,5k-14