1. 

   math_celebrity Administrator Staff Member

   Since it's a sum, we add our two variables a and d.
   
   a + d

    

   math_celebrity, Aug 21, 2016

   #1
   
   
2. 

   math_celebrity Administrator Staff Member

   I just added this as an official shortcut.

    

   math_celebrity, Aug 21, 2016

   #2
   
   

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