Help gan Tentukan nilai dari ³log 21 - ³log 2× ²log 7 + ³log9

[tex] {}^{3} log21 - {}^{3} log2 \times {}^{2} log7 + {}^{3} log9 \\ {}^{3} log21 - {}^{3} log7 + {}^{3} log9 \\ {}^{3} log( \frac{21}{7} \times 9 ) \\ {}^{3} log27 \\ 3[/tex]