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D( x )
x = 0
4*x = 0
x+9 = 0
x = 0
x = 0
4*x = 0
4*x = 0
4*x = 0 // : 4
x = 0
x+9 = 0
x+9 = 0
x+9 = 0 // - 9
x = -9
x in (-oo:-9) U (-9:0) U (0:+oo)
1/(4*x)-(2/x) = -7/(x+9) // + -7/(x+9)
1/(4*x)-(-7/(x+9))-(2/x) = 0
7*(x+9)^-1+1/(4*x)-2*x^-1 = 0
7/(x+9)+1/(4*x)-2/x = 0
(4*7*x*x)/(4*x*x*(x+9))+(1*x*(x+9))/(4*x*x*(x+9))+(-2*4*x*(x+9))/(4*x*x*(x+9)) = 0
1*x*(x+9)-2*4*x*(x+9)+4*7*x*x = 0
29*x^2-8*x^2+9*x-72*x = 0
21*x^2-63*x = 0
21*x^2-63*x = 0
21*x*(x-3) = 0
x-3 = 0 // + 3
x = 3
21*x*(x-3) = 0
(21*x*(x-3))/(4*x*x*(x+9)) = 0
(21*x*(x-3))/(4*x*x*(x+9)) = 0 // * 4*x*x*(x+9)
21*x*(x-3) = 0
( 21*x )
21*x = 0 // : 21
x = 0
( x-3 )
x-3 = 0 // + 3
x = 3
x in { 0}
x = 3
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