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Answer :

Big triangle

(x + 5)/x = (11 + x) / (x + 3)

(x + 5)(x + 3) = x(11 + x)

x^2 + 5x + 3x + 15 = 11x + x^2

Simplify

x^2 - x^2 + 5x + 3x - 11x = -15

8x - 11x = -15

-3x = -15

x = -15/-3

x = 5

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