0\\\\ 5^{4x}=25*5^{4x-2}\\\\ 25t+3t=140\\\\ 28t=140\\\\ t=5\\\\ 5^{4x-2}=5\\\\ 4x-2=1\\\\ 4x=3\\\\ x=0,75 " alt=" 5^{4x-2}=t>0\\\\ 5^{4x}=25*5^{4x-2}\\\\ 25t+3t=140\\\\ 28t=140\\\\ t=5\\\\ 5^{4x-2}=5\\\\ 4x-2=1\\\\ 4x=3\\\\ x=0,75 " align="absmiddle" class="latex-formula">