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1/z + 1/x =9...(2)
1/z + 1/y =10...(3)
subtitusikan pers 2 dan 3 ke pers 1.. sehingga nilai dari:
1/x=2
1/y=3
1/z=7
maka 1/x + 1/y + 1/z = 2+3+7=12...(D)