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x in (-oo:+oo)
300 = (0.3*x^3)/4 // - (0.3*x^3)/4
300-((0.3*x^3)/4) = 0
300-0.075*x^3 = 0
-0.075*x^3 = -300 // : -0.075
x^3 = 4000
x^3 = 4000 // ^ 1/3
x = 10*4^(1/3)
x = 10*4^(1/3)
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