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D( x )
-x-10 = 0
-x-10 = 0
-x-10 = 0
-x-10 = 0 // + 10
-x = 10 // * -1
x = -10
x in (-oo:-10) U (-10:+oo)
(-9*x)/(-x-10) = 0
-9*x = 0 // : -9
x = 0
x = 0
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