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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
396/X-10 = -22 // + 22
396/X-10+22 = 0
396*X^-1 = -12 // : 396
X^-1 = -1/33
-1 < 0
1/(X^1) = -1/33 // * X^1
1 = -1/33*X^1 // : -1/33
-33 = X^1
X = -33
X = -33
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