Answer:
Explanation:
In a parallelogram, opposite angles are equal. So we can set the two opposite angles equal to each other and solve for x:
17x + 3 = 19x - 5
Simplifying the equation, we get:
-2x = -8
Dividing both sides by -2, we get:
x = 4
Therefore, for ABCD to be a parallelogram, x must be equal to 4.