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x in (-oo:+oo)
x^2*(2700-(x*((x^2)/4))) = 0
x^2*((-1/4)*x^3+2700) = 0
x^2*(2700-1/4*x^3) = 0
( 2700-1/4*x^3 )
-1/4*x^3 = -2700 // : -1/4
x^3 = 10800
x^3 = 10800 // ^ 1/3
x = 6*50^(1/3)
( x^2 )
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in { 6*50^(1/3), 0 }
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