Question 117272
From your explanation, I think this is what you mean,
{{{sqrt(5-2x)/3=1}}}
{{{sqrt(5-2x)=3}}} Multiply both sides by (3).
{{{(5-2x)=9}}} Square both sides.
{{{-2x=4}}} Subtract (5) from boths sides.
{{{highlight(x=-2)}}} Divide both sides by (-2). 
Always check your answer. 
{{{sqrt(5-2x)/3=1}}}
{{{sqrt(5-2(-2))/3=1}}}
{{{sqrt(5+4)/3=1}}}
{{{sqrt(9)/3=1}}}
{{{3/3=1}}}
{{{1=1}}}
True statement. 
Good answer.