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D( x )
9*x-5 = 0
9*x-5 = 0
9*x-5 = 0
9*x-5 = 0 // + 5
9*x = 5 // : 9
x = 5/9
x in (-oo:5/9) U (5/9:+oo)
((5*(5/15)*x)/(9*x-5))*(9*x+5)+9*x = 0
(5/3*x*(9*x+5))/(9*x-5)+9*x = 0
(5/3*x*(9*x+5))/(9*x-5)+(9*x*(9*x-5))/(9*x-5) = 0
5/3*x*(9*x+5)+9*x*(9*x-5) = 0
96*x^2-110/3*x = 0
96*x^2-110/3*x = 0
2*x*(48*x-55/3) = 0
48*x-55/3 = 0 // + 55/3
48*x = 55/3 // : 48
x = 55/3/48
x = 55/144
2*x*(x-55/144) = 0
(2*x*(x-55/144))/(9*x-5) = 0
(2*x*(x-55/144))/(9*x-5) = 0 // * 9*x-5
2*x*(x-55/144) = 0
( 2*x )
2*x = 0 // : 2
x = 0
( x-55/144 )
x-55/144 = 0 // + 55/144
x = 55/144
x in { 0, 55/144 }
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