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log3(x-1)+log3(x+5)
En la desigualdad la incógnita

Solución

log(x - 1)   log(x + 5)   log(5*x + 1)
---------- + ---------- < ------------
  log(3)       log(3)        log(3)   
$$\frac{\log{\left(x - 1 \right)}}{\log{\left(3 \right)}} + \frac{\log{\left(x + 5 \right)}}{\log{\left(3 \right)}} < \frac{\log{\left(5 x + 1 \right)}}{\log{\left(3 \right)}}$$
log(x - 1)/log(3) + log(x + 5)/log(3) < log(5*x + 1)/log(3)