Question 240353
You want to get x "by itself" on one side of the equal sign
{{{(-2/7)x = 1/5}}}
Let's go one small step at a time
1) clear the denominator on the left side. 
{{{(-2/7)x = 1/5}}} multiply both sides by 7
{{{-2x = 7/5}}} divide both sides by -2
{{{x = 7/(5*(-2))}}}
{{{x = -7/10}}}

Check your answer
Does {{{(-2/7)*(-7/10) = 1/5}}}