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a. (6p - 5q - 2r) + (-8p + 6q + 9r) = 6p-8p -5q+6q - 2r + 9r
= -2p + q + 7r
Pengurangan :
b. (15p + 18q - 17) - (12p - 7q + 6) = 15p - 12p + 18q+ 7q - 17-6
= 3p 15q - 23