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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
9/4 > 7/X // - 7/X
9/4-(7/X) > 0
9/4-7*X^-1 > 0
-7*X^-1 > -9/4
-7*X^-1 > -9/4 // * -1
7*X^-1 < 9/4
7*X^-1 < 9/4 // : 7
X^-1 < 9/4/7
X^-1 < 9/28
1/(X^1) < 9/28
X <> 0
1/(X^1) < 9/28 // * X^2
(X^2)/(X^1) < 9/28*X^2
X^1 < 9/28*X^2
X-9/28*X^2 < 0
X^1*(1-9/28*X) < 0
X < 0
-(abs(X))^1*(9/28*(abs(X))^1+1) < 0 // : -(abs(X))^1
9/28*(abs(X))^1+1 > 0
9/28*(abs(X))^1 > -1 // : 9/28
(abs(X))^1 > -1/9/28
(abs(X))^1 > -28/9 // ^ 1/1
abs(X) > (-28/9)^(1/1)
abs(X) > -28/9
X in (-oo:0)
X < 0
X > 0
X^1*(1-(9/28*X^1)) < 0 // : X^1
1-(9/28*X^1) < 0
1 < 9/28*X^1 // : 9/28
1/9/28 < X^1 // ^ 1/1
(1/9/28)^(1/1) < X
X in (28/9:+oo)
X > 0
X in (-oo:0) U (28/9:+oo)
X in (-oo:0) U (28/9:+oo)
(-oo:0) U (28/9:+oo)
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