Question 389708
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Hi,  
I. Assigning the variable       
Let x represent the time it took to drive 'back home'
II.Writing as we Read*** 
 30min = 2x - 12min
  III.solving for x
     42min = 2x
      21min = x, the time it took to drive 'back home'

IV. CHECKING Our Answer***
  30min = 2*21min - 12min = 44min - 12min = 30min