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x in (-oo:+oo)
((x^2+56)^1)/2 = 9 // - 9
((x^2+56)^1)/2-9 = 0
(x^2+56)/2-9 = 0
(x^2+56)/2+(-9*2)/2 = 0
x^2-9*2+56 = 0
x^2+38 = 0
(x^2+38)/2 = 0
(x^2+38)/2 = 0 // * 2
x^2+38 = 0
1*x^2 = -38 // : 1
x^2 = -38
x belongs to the empty set
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