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D( x )
x+5 = 0
x+5 = 0
x+5 = 0
x+5 = 0 // - 5
x = -5
x in (-oo:-5) U (-5:+oo)
144/(x+5) = 9 // - 9
144/(x+5)-9 = 0
144/(x+5)+(-9*(x+5))/(x+5) = 0
144-9*(x+5) = 0
99-9*x = 0
(99-9*x)/(x+5) = 0
(99-9*x)/(x+5) = 0 // * x+5
99-9*x = 0
99-9*x = 0 // - 99
-9*x = -99 // : -9
x = -99/(-9)
x = 11
x = 11
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