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X in (-oo:+oo)
X = 0.2^3-((0.2^4)/0.0008) // - 0.2^3-((0.2^4)/0.0008)
X-0.2^3+(0.2^4)/0.0008 = 0
X+1250*0.2^4-0.2^3 = 0 // - 1250*0.2^4-0.2^3
X = -(1250*0.2^4-0.2^3)
X = 0.2^3-(1250*0.2^4)
X = 0.2^3-(1250*0.2^4)
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