Question 168453
{{{1/5 - (-2/7)}}}
so the two negatives will give you a positive,
{{{1/5+2/7}}}, then use a common denominator
{{{ 1/5=7/35}}} and {{{2/7=10/35}}}
so {{{1/5+2/7=7/35+10/35=17/35}}} and 17/35 is the simplest form.