1) 2xa+2xb+ya+yb
2)a-4-ba+4b
3)5am-5an+7bm-7bn
4)24x^2+6x-44x-11
5)ac-ad+bd-bc
6)x^2-6x-60+10x
7)b^2-20b+20-b
8)6a^2-18ab-39b^2-13ab
9)m^2-18m+81-3m+27
10)a^3+10a^2+25a+a+5
11)m^2-3-nm^4+6m^2n-9n
12)8cp-96c+7dp^2-168pd+1008d
1) 2xa+2xb+ya+yb
2)a-4-ba+4b
3)5am-5an+7bm-7bn
4)24x^2+6x-44x-11
5)ac-ad+bd-bc
6)x^2-6x-60+10x
7)b^2-20b+20-b
8)6a^2-18ab-39b^2-13ab
9)m^2-18m+81-3m+27
10)a^3+10a^2+25a+a+5
11)m^2-3-nm^4+6m^2n-9n
12)8cp-96c+7dp^2-168pd+1008d