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= 4/(x-2)(x+2) - 2/(x-2)
= 4-(2x+4) / (x-2)(x+2)
= 4-(2(x+2)) / (x-2)(x+2)
dimana, (x+2) yang ada di pembilang dan pennyebut dapat dicoret sehingga menjadi :
= 2/(x-2)
semoga membantu :)