We will solve this question by taking the options.
Suppose x = 11
x+4 = 15, x-3 = 8
Hyptenuse = $$\sqrt{225+64} = 17$$
17-11 = 6
$$6^2+(x-3)^2 = y^2$$
x-3 = 8
y = 10 which is similar to what is given in the question.
Hence x = 11
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