jika x0 adalah penyelesaian da

[tex] {81}^{3 - x} = \frac{1}{27} \\ {3}^{4(3 - x)} = {3}^{ - 3} \\ 4(3 - x) = - 3 \\ 12 - 4x = - 3 \\ - 4x = - 3 - 12 \\ - 4x = - 15 \\ x = \frac{15}{4} \\ 4x\\ = 4( \frac{15}{4} ) \\ = 15[/tex]
Jawaban: D. 15

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