Solve for xxx: log10(x)−log10(x−9)=1\log_{10}(x) - \log_{10}(x-9) = 1log10(x)−log10(x−9)=1.
x=10x = 10x=10
x=9x = 9x=9
x=11x = 11x=11
x=1x = 1x=1