You can put this solution on YOUR website! Solve for x assuming that ln and log are both natural logarithms:
log(x+6)+log(x+6)= 4
2log(x+6) = 4
Divide both sides by 2:
log(x+6) = 2
Cancel logarithms by taking the exponent of both sides:
x+6 = e^2
Subtract 6 from both sides:
x = e^2-6