tolong di bantu dong tentang aljabar yg saya ceklis in

8p-3+(-3p)+8
=8p-3p-3+8
=5p+5

9m+4mn+(-12m)-7mn
=9m-12m+4mn-7mn
=-3m-3mn

4m-5-6m+8
=4m-6m-5+8
=-2m+3

2(x+3)
=2x+6