tolong jawab soal aljabar saya

(42n+35m+7) - (-50m-20n+9)
42n+35m+7+50m+20n-9
62n+8m-2

(5x+3) - (x-1)
5x+3-x+1
4x+4

(2y+15z) -(4y-8)
2y+15z-4y+8
-2y+23z

JADIKAN JAWABAN TERBAIK DAN FOLLOW BRAINLY SAYA YA...