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= 15 akar 5 - 15 akar 2, per 5 - 2
= 15 akar 5 - 15 akar 2 per 3
= 5 akar 5 - 5 akar 2
= 15 / (√5 + √2) * (√5 - √2) / (√5 - √2)
= (15(√5 - √2)) / (5 - 2)
= (15(√5 - √2)) / 3
= 5(√5 - √2)