Find the value of x for which ABCD must be a parallelogram

Answer:
x = 7
Explanation:
Beacause lines AD and BC are parallel, the interior opposite angles formed by line BD are congruent or equal. Therefore, (3x-17) = (25-3x) Now solve for X:
First Add 3x to both sides: 6x-17=25
Add 17 to both sides: 6x=42
Last divide both sides by 6: x=7