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= 7 + 12 akar 3
2. 4 akar 5 - 2 akar 5 + 3 akar 5
= 5 akar 5
3. 2 akar 5 + 5 akar 5 + 2 akar 5 + 4 akar 7
= 9 akar 5 + 4 akar 7