Tolong,,, bantu kerjain soal ini,

1. 5y-4z- (3y-2z)
=5y-3y-4z-2z
=2y-6z

2. -m+8-(9m-6n)
= -m-9m+8-6n
= -10m+8-6n

3. -6p+3a-(-3p-7a)
= -6p-3p+3a-7a
= -9p-4a

maaf kalau salah