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x in (-oo:+oo)
(x^1)/2 = 300 // - 300
(x^1)/2-300 = 0
x/2-300 = 0
1/2*x-300 = 0 // + 300
1/2*x = 300 // : 1/2
x = 300/1/2
x = 600
x = 600
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