Question 443089
I'd say the first thing you need to do is multiply by 100x.
{{{(100x-4000)/100x = .3}}}
{{{100x-4000 = 30x}}}
{{{-4000 = -70x}}}
{{{x = 4000/70 = 400/7}}}
Your answer is {{{400/7}}} or {{{57.1}}} if you need it in decimal form.