13^2-x^2=15^2-(14-x)^2
(14-x)^2-x^2=15^2-13^2
(14-x+x)(14-x-x)=(15+13)(15-13)
14(14-2x)=28×2
14×2×(7-x)=28×2
7-x=2
x=5
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