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BiologiaMagister
If they're similar maybe the difference between the side of length 5 and x is also 2 (10 - 8 = 2):

5-2 = 3.

x = 3


Hope it helped,

Happy homework/ study/ exam!
Corresponding sides are in the amae ratio when triangles are similar. So

5/10 = x / 8
10x = 40
x = 4

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