The sum of all real values of \( x \) satisfying the equation \( \left(x^{2}-5 x+5\right)^{x^{2}...

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The sum of all real values of \( x \) satisfying the equation \( \left(x^{2}-5 x+5\right)^{x^{2}+4 x-60}=1 \) is
[JEE Main 2016, 4M]
(a) 6
(b) 5
(c) 3
(d) \( -4 \)
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