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D( x )
4*x^2-36 = 0
x-3 = 0
x+3 = 0
4*x^2-36 = 0
4*x^2-36 = 0
4*x^2 = 36 // : 4
x^2 = 9
x^2 = 9 // ^ 1/2
abs(x) = 3
x = 3 or x = -3
x-3 = 0
x-3 = 0
x-3 = 0 // + 3
x = 3
x+3 = 0
x+3 = 0
x+3 = 0 // - 3
x = -3
x in (-oo:-3) U (-3:3) U (3:+oo)
(2*x)/(x+3)-((2*x)/(x-3)) = 72/(4*x^2-36) // - 72/(4*x^2-36)
(2*x)/(x+3)-((2*x)/(x-3))-(72/(4*x^2-36)) = 0
(2*x)/(x+3)-2*x*(x-3)^-1-72*(4*x^2-36)^-1 = 0
(2*x)/(x+3)+(-2*x)/(x-3)-72/(4*x^2-36) = 0
(2*x*(x-3)*(4*x^2-36))/((x+3)*(x-3)*(4*x^2-36))+(-2*x*(x+3)*(4*x^2-36))/((x+3)*(x-3)*(4*x^2-36))+(-72*(x+3)*(x-3))/((x+3)*(x-3)*(4*x^2-36)) = 0
2*x*(x-3)*(4*x^2-36)-2*x*(x+3)*(4*x^2-36)-72*(x+3)*(x-3) = 0
432*x-48*x^3-72*x^2+648 = 0
432*x-48*x^3-72*x^2+648 = 0
24*(18*x-2*x^3-3*x^2+27) = 0
18*x-2*x^3-3*x^2+27
2*x*(9-x^2)-3*x^2+27
3*(9-x^2)+2*x*(9-x^2)
(2*x+3)*(9-x^2)
24*(2*x+3)*(9-x^2) = 0
(24*(2*x+3)*(9-x^2))/((x+3)*(x-3)*(4*x^2-36)) = 0
(24*(2*x+3)*(9-x^2))/((x+3)*(x-3)*(4*x^2-36)) = 0 // * (x+3)*(x-3)*(4*x^2-36)
24*(2*x+3)*(9-x^2) = 0
( 2*x+3 )
2*x+3 = 0 // - 3
2*x = -3 // : 2
x = -3/2
( 9-x^2 )
-1*x^2 = -9 // : -1
x^2 = 9
x^2 = 9 // ^ 1/2
abs(x) = 3
x = 3 or x = -3
x in { 3}
x in { -3}
x = -3/2
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