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= 6a-8a -5b+6b -2c+9c
= -2a+b+7c
1b) 5p(4p-3) + 7p(3p+4)
= 20p^2-15p + 21p^2+28p
= 41p^2+13p
2a) 9p+12 - 7p+14
= 2p-2
2b) 4x-11y-9z - (-8x)+10y+9z
= 4x+8x - 11y-10y -9z -9z
= 12x -21y -18z
ps: nomer 2b itu masih ragu, dan dicek ya semuanyaaa
b. 5p(4p -3) + 7p(3p +4) = 20p^2 -15p + 21p^2 + 28p= 41p^2 + 13p
2. a. 7p + 14 - 9p -12 = -2p + 2
b. -8x + 10y + 9z - 4x + 11y + 9z = -12x + 21y + 18z