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= 8p +(-3p) -3 +8
= 5p +5
b. 9m +4mn +(-12m) -7mn
= 9m +(-12m) +4mn -7mn
= -3m -3mn
Itu jawabannya.
b. 9m - 12m + 4mn - 7mn = -3m - 3mn atau -3m (1 - n)