Question 8234
 3n - {{{2/5}}} = {{{7/10}}}
3n -{{{2/5}}}+{{{2/5}}} = {{{7/10}}}+{{{2/5}}}
3n={{{7/10}}}+{{{4/10}}}
3n={{{11/10}}}
{{{3n/3}}}={{{(11/10)(1/3)}}}
n={{{11/30}}}