SOLUTION: find the value of x for which ABCD must be a parallelogram...18-4x,7x+7 is given

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Question 463452: find the value of x for which ABCD must be a parallelogram...18-4x,7x+7 is given
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
Are those the sides? the angles?
Insufficient data