Question 431228
{{{4+ 2log(3, 7x) = 10}}}
<==> {{{2log(3,7x) = 6}}}
<==> {{{log(3,7x) = 3}}}
<==> {{{3^3 = 27 = 7x}}}
==> x = 27/7.

Since this value also satisfies the original equation, this is the final answer.