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x in (-oo:+oo)
(x^1)/2 = 13 // - 13
(x^1)/2-13 = 0
x/2-13 = 0
1/2*x-13 = 0 // + 13
1/2*x = 13 // : 1/2
x = 13/1/2
x = 26
x = 26
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