We have AB = CD and AD = BC;
Then, x + 15 = 3x + 25 and 2x + 18 = 3 - x;
15 - 25 = 3x - x and 2x + x = 3 - 18;
- 10 = 2x and 3x = - 15 ;
x = - 5 and x = - 5;
The correct answer is x = - 5;
B) x = - 5
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