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D( x )
8*x-9 = 0
8*x-9 = 0
8*x-9 = 0
8*x-9 = 0 // + 9
8*x = 9 // : 8
x = 9/8
x in (-oo:9/8) U (9/8:+oo)
x = (3*x)/(8*x-9) // - (3*x)/(8*x-9)
x-((3*x)/(8*x-9)) = 0
x-3*x*(8*x-9)^-1 = 0
(-3*x)/(8*x-9)+x = 0
(-3*x)/(8*x-9)+(x*(8*x-9))/(8*x-9) = 0
x*(8*x-9)-3*x = 0
8*x^2-12*x = 0
8*x^2-12*x = 0
4*x*(2*x-3) = 0
2*x-3 = 0 // + 3
2*x = 3 // : 2
x = 3/2
4*x*(x-3/2) = 0
(4*x*(x-3/2))/(8*x-9) = 0
(4*x*(x-3/2))/(8*x-9) = 0 // * 8*x-9
4*x*(x-3/2) = 0
( 4*x )
4*x = 0 // : 4
x = 0
( x-3/2 )
x-3/2 = 0 // + 3/2
x = 3/2
x in { 0, 3/2 }
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