log 8 12-log 8 15 + log 8 20= ?

log 8 12 - log 8 15 + log 8 20 = log 8 \(\frac{12 \times 20}{15}\) = log 8 \(\frac{240}{15}\) = log 8 16 = log 8 2^4 = \(\frac{4}{3}\)