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x in (-oo:+oo)
100-((x^1)/3) = 6.58 // - 6.58
100-((x^1)/3)-6.58 = 0
100-(x/3)-6.58 = 0
93.42-1/3*x = 0 // - 93.42
-1/3*x = -93.42 // : -1/3
x = -93.42/(-1/3)
x = 280.2600028
x = 280.2600028
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