Solve each of the following equations for x.

a) $\mathrm{ln}(5x)=0\phantom{\rule{0ex}{0ex}}x=?$

b) ${\mathrm{log}}_{5}(2x)+{\mathrm{log}}_{5}(4x)=2\phantom{\rule{0ex}{0ex}}x=?$

a) $\mathrm{ln}(5x)=0\phantom{\rule{0ex}{0ex}}x=?$

b) ${\mathrm{log}}_{5}(2x)+{\mathrm{log}}_{5}(4x)=2\phantom{\rule{0ex}{0ex}}x=?$