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2p -9q -7r -(-6p +8q -7r)
2p -9q -7r +6p -8q +7r
2p +6p -9q -8q -7r +7r
8p -17q
b. Dibalik dahulu
3(5x +4y -8) -4(3x +5y -7)
15x +12y -24 -12x -20y +28
15x -12x +12y -20y -24 +28
3x -8y +4
= -6p + 8q - 7r - 2p + 9q + 7r
= -6p - 2p + 8q + 9q - 7r + 7r
= -8p + 17q
b. 4(3x + 5y - 7) - 3(5x + 4y - 8)
= 12x + 20y - 28 - 15x - 12y + 32
= 12x - 15x + 20y - 12y - 28 + 32
= -3x + 8y + 4