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X in (-oo:+oo)
(X^1)/2 = 7 // - 7
(X^1)/2-7 = 0
X/2-7 = 0
1/2*X-7 = 0 // + 7
1/2*X = 7 // : 1/2
X = 7/1/2
X = 14
X = 14
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