Даю 99 баллов! Помогите!
-0,6b•4y;
-k-k-5a-a-a-a;
5,17y+9,31y+4,83y-2y;
1,7x-1,2y-1,7x+0,5x;
7-x+y+x-y;
-k-(m-n);
k-(-m-n);
-a+(b-c)-(x-y);
25-(m-n)-(a-b);
6x+(7-3x);
-(4x-18)+18;
(2a-7y)-(5a-7y);
(11p+9c)-(12+11p+9c);
(2-4b)-(31b-6)-11;
14b-(15b+y)-(y+10b);
6(c+1)-6c-5;
19y+2(3-4y)+11y;
21x-7-4(9x+3);
33-8(11b-1)-2b.