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