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D( x )
3*x = 0
3*x = 0
3*x = 0
3*x = 0 // : 3
x = 0
x in (-oo:0) U (0:+oo)
1368/(3*x) = -6 // + 6
1368/(3*x)+6 = 0
456*x^-1 = -6 // : 456
x^-1 = -1/76
-1 < 0
1/(x^1) = -1/76 // * x^1
1 = -1/76*x^1 // : -1/76
-76 = x^1
x = -76
x = -76
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