Question 635742
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Hi,
Do not let the radical bother You.  Isolate it and square it away!
{{{-sqrt(2x+1) = -9 }}}
{{{sqrt(2x+1) = 9 }}}    | Squaring <u>both sides</u> of the EQ
      2x + 1 = 81
          2x = 80
           x = 40