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16c+11ab-4a+8a+b-5c = 11c + 11ab + 4a + b
yang pengurangannya :
16c+11ab-4a-8a+b-5c = 11c + 11ab - 12a + b
(16c + 11ab - 4a) + (8a +b -5c) = 16c+11ab-4a+8a+b-5c= 4a + b + 11ab + 11c