Question 557782
{{{2*10^x+10^(x+1)=4}}} --> {{{2*10^x+10^x*10^1=4}}} --> {{{2*10^x+10*10^x=4}}} --> {{{(2+10)10^x=4}}} --> {{{12*10^x=4}}} --> {{{10^x=4/12}}} --> {{{10^x=1/3}}} --> {{{x=log(1/3)}}} --> {{{x=-log(3)}}}