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D( x )
x-18 = 0
x+18 = 0
x^2-324 = 0
x-18 = 0
x-18 = 0
x-18 = 0 // + 18
x = 18
x+18 = 0
x+18 = 0
x+18 = 0 // - 18
x = -18
x^2-324 = 0
x^2-324 = 0
1*x^2 = 324 // : 1
x^2 = 324
x^2 = 324 // ^ 1/2
abs(x) = 18
x = 18 or x = -18
x in (-oo:-18) U (-18:18) U (18:+oo)
2/(x+18)-(3/(x-18)) = (5*x)/(x^2-324) // - (5*x)/(x^2-324)
2/(x+18)-(3/(x-18))-((5*x)/(x^2-324)) = 0
2/(x+18)-3*(x-18)^-1-5*x*(x^2-324)^-1 = 0
2/(x+18)-3/(x-18)+(-5*x)/(x^2-324) = 0
(2*(x-18)*(x^2-324))/((x+18)*(x-18)*(x^2-324))+(-3*(x+18)*(x^2-324))/((x+18)*(x-18)*(x^2-324))+(-5*x*(x+18)*(x-18))/((x+18)*(x-18)*(x^2-324)) = 0
2*(x-18)*(x^2-324)-3*(x+18)*(x^2-324)-5*x*(x+18)*(x-18) = 0
324*x-x^3-5*x^3-90*x^2+1620*x+29160 = 0
1944*x-6*x^3-90*x^2+29160 = 0
1944*x-6*x^3-90*x^2+29160 = 0
6*(324*x-x^3-15*x^2+4860) = 0
324*x-x^3-15*x^2+4860
15*(324-x^2)-x^3+324*x
x*(324-x^2)+15*(324-x^2)
(x+15)*(324-x^2)
6*(x+15)*(324-x^2) = 0
(6*(x+15)*(324-x^2))/((x+18)*(x-18)*(x^2-324)) = 0
(6*(x+15)*(324-x^2))/((x+18)*(x-18)*(x^2-324)) = 0 // * (x+18)*(x-18)*(x^2-324)
6*(x+15)*(324-x^2) = 0
( 324-x^2 )
-1*x^2 = -324 // : -1
x^2 = 324
x^2 = 324 // ^ 1/2
abs(x) = 18
x = 18 or x = -18
( x+15 )
x+15 = 0 // - 15
x = -15
x in { 18}
x in { -18}
x = -15
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