Answer:
5
Step-by-step explanation:
In a parallelogram opposite angles are congruent. If the measure of BCD is 51°, then the measure of BED is also 51°.
That allows us to write an equation for triangle BDE, knowing the sum of the internal angles is 180°:
[tex]14x+4+55+51=180\rightarrow 14x=70 \rightarrow x=5[/tex]
