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D( X )
3*X = 0
2*X = 0
3*X = 0
3*X = 0
3*X = 0 // : 3
X = 0
2*X = 0
2*X = 0
2*X = 0 // : 2
X = 0
X in (-oo:0) U (0:+oo)
5/(2*X)-(8/9) = 1/18-(1/(3*X)) // - 1/18-(1/(3*X))
5/(2*X)+1/(3*X)-(8/9)-(1/18) = 0
5/(2*X)+1/(3*X)-8/9-1/18 = 0
17/6*X^-1 = 17/18 // : 17/6
X^-1 = 1/3
-1 < 0
1/(X^1) = 1/3 // * X^1
1 = 1/3*X^1 // : 1/3
3 = X^1
X = 3
X = 3
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