Answer :

[tex]D:10-4x\ \textgreater \ 0 \wedge 10-3x\ \textgreater \ 0\\ D:4x\ \textless \ 10 \wedge 3x\ \textless \ 10\\ D:x\ \textless \ 2.5 \wedge x\ \textless \ 3.\overline{3}\\ D:x\ \textless \ 2.5\\\\ \log(10-4x)=\log(10-3x)\\ 10-4x=10-3x\\ -3x+4x=10-10\\ x=0 [/tex]