1)3a - 8a + c=......... 2)2x + 7b - 8x + 3c + 9b=......

1)-5a+c
2)-6X+15b+3c
gak pake cara gak papa kan

1) 3a-8a+c = 5a+c (5a=-c)
2) 2x+7b-8x+3c+9b = -6x+16b+3c (-6x+16b =-3c

maaf kalo salah.