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D( x )
-x = 0
-x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.0025 = -3*((2*x)/(-x))*x // + -3*((2*x)/(-x))*x
0.0025-(-3*((2*x)/(-x))*x) = 0
0.0025-6*x = 0
0.0025-6*x = 0 // - 0.0025
-6*x = -0.0025 // : -6
x = -0.0025/(-6)
x = 0.00041667
x = 0.00041667
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