If $$ {3x+}{2 over { sqrt{x}}}=1$$ then $$ {x-{ sqrt{x}}}=?$$

• A. $$ {-2 over { sqrt{3}}}$$
• B. $$ {-3 over { sqrt{3}}}$$
• C. $$ {2 over { sqrt{3}}}$$
• D. $$ {-1 over { sqrt{3}}}$$