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SortOfNerdy
Because base angles are congruent, both angle A and B are congruent. If the two triangles are congruent, then the base angles are the same, meaning 5x=50*. Divide by 10 and you get the answer of x=5. :) Hope this helps!

Answer:

the answer is 10

Step-by-step explanation:

if b is congruent to e

(which it is)

e=50 degrees

50/5=10

x=10