tolong bantu, jawab dgn benar dan diberi jalannya no. 2 ajja

2a.(-3m+4n-6)+(7n+8m+10)
=-3m+8n+4n+7n-6+10
=5m+11n-4
b.(15a+7b+5c)+(-11a-12b+13d)
=15a-11a+7b-12b+5c+13d
=4a-5b+5c+13d

maaf kalau salah
semoga membantu:)