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I'm trying to number an equation, which spans over several lines. I need for it to look like this

Wanted design of equation

My current tex for this is:


 {\it ``If A is true, then B is true\\
  A is true \\ 
  \\Therefore, B is true''}
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up vote 9 down vote accepted
  ``If  $A$ is true, then $B$ is true\\
  $A$ is true \\\hline
  Therefore, $B$ is true''

enter image description here

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