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4a = a/(1 - 1/a)
4 = 1/((a - 1)/a)
4 = a/(a - 1)
4a - 4 = a
3a = 4
a = 4/3
4a=a/1-1/a
4a=a²/a-1
4a²-4a=a²
3a²-4a=0
a(3a-4)=0
a=0 atau a=4/3