3(log10^2-log10^24)/(log10^3+log10^27)

Equations:2 log 106 - 1/3 log 10 27= log 10xlog 10 x + log 10 (x + 21) = 2
log 4 x + log 4 9 = log 4 27
log 2 3 x + log 2 5 = log 2 30
log 7 24 - log 7 ( x + 5) = log 7 8