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D( x )
4*x-18 = 0
4*x-18 = 0
4*x-18 = 0
4*x-18 = 0 // + 18
4*x = 18 // : 4
x = 18/4
x = 9/2
x in (-oo:9/2) U (9/2:+oo)
2*x-(((9/3)*x)/(4*x-18)) = 0
2*x-3*x*(4*x-18)^-1 = 0
(-3*x)/(4*x-18)+2*x = 0
(-3*x)/(4*x-18)+(2*x*(4*x-18))/(4*x-18) = 0
2*x*(4*x-18)-3*x = 0
8*x^2-39*x = 0
8*x^2-39*x = 0
x*(8*x-39) = 0
8*x-39 = 0 // + 39
8*x = 39 // : 8
x = 39/8
x*(x-39/8) = 0
(x*(x-39/8))/(4*x-18) = 0
(x*(x-39/8))/(4*x-18) = 0 // * 4*x-18
x*(x-39/8) = 0
( x-39/8 )
x-39/8 = 0 // + 39/8
x = 39/8
( x )
x = 0
x in { 39/8, 0 }
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