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D( x )
10-(27/x) < 0
x = 0
10-(27/x) < 0
10-(27/x) < 0
10-27*x^-1 < 0
-27*x^-1 < -10
-27*x^-1 < -10 // * -1
27*x^-1 > 10
27*x^-1 > 10 // : 27
x^-1 > 10/27
1/(x^1) > 10/27
x <> 0
1/(x^1) > 10/27 // * x^2
(x^2)/(x^1) > 10/27*x^2
x^1 > 10/27*x^2
x-10/27*x^2 > 0
x^1*(1-10/27*x) > 0
x < 0
-(abs(x))^1*(10/27*(abs(x))^1+1) > 0 // : -(abs(x))^1
10/27*(abs(x))^1+1 < 0
10/27*(abs(x))^1 < -1 // : 10/27
(abs(x))^1 < -1/10/27
(abs(x))^1 < -27/10 // ^ 1/1
abs(x) < (-27/10)^(1/1)
abs(x) < -27/10
x belongs to the empty set
x < 0
x > 0
x^1*(1-(10/27*x^1)) > 0 // : x^1
1-(10/27*x^1) > 0
1 > 10/27*x^1 // : 10/27
1/10/27 > x^1 // ^ 1/1
(1/10/27)^(1/1) > x
x in (0:27/10)
x > 0
x in (0:27/10)
x = 0
x = 0
x in (-oo:0) U <27/10:+oo)
x*(10-(27/x))^1.1 = 0
x*(10-27*x^-1)^1.1 = 0
( 10-27*x^-1 )
-27*x^-1 = -10 // : -27
x^-1 = 10/27
-1 < 0
1/(x^1) = 10/27 // * x^1
1 = 10/27*x^1 // : 10/27
27/10 = x^1
x = 27/10
( x )
x = 0
x in { 0}
x = 27/10
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