Question 393709
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Hi
Let x and (3x + 1)represent the width and length respectively
Might recommend using the above format prior to Writing the Equation
Question states*** A = L*W
 L*W     = 2*L   the question states is true in this  question
 x(3x+1) = 2(3x + 1)
      x = 2, the width. the length is 7  (3*2 + 1)

CHECKING our Answer
   2*7 = 2*7