Question 1187269
other leg, x
shortest leg, x-7
hypotenuse, 17


{{{x^2+(x-7)^2=17^2}}}

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Or,
interesting article,   https://en.wikipedia.org/wiki/Pythagorean_triple
showing 8, 15, 17.


{{{15-7=8}}}
and
{{{8^2+15^2}}}
{{{64+225}}}
{{{289=17^2}}}