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x in (-oo:+oo)
6000 = 2*((3*x)/2)*x // - 2*((3*x)/2)*x
6000-(2*((3*x)/2)*x) = 0
6000-3*x^2 = 0
-3*x^2 = -6000 // : -3
x^2 = 2000
x^2 = 2000 // ^ 1/2
abs(x) = 20*5^(1/2)
x = 20*5^(1/2) or x = -(20*5^(1/2))
x in { 20*5^(1/2), -(20*5^(1/2)) }
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