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D( x )
x-10 = 0
x-10 = 0
x-10 = 0
x-10 = 0 // + 10
x = 10
x in (-oo:10) U (10:+oo)
-36/(x-10) = 9 // - 9
-36/(x-10)-9 = 0
(-9*(x-10))/(x-10)-36/(x-10) = 0
-9*(x-10)-36 = 0
54-9*x = 0
(54-9*x)/(x-10) = 0
(54-9*x)/(x-10) = 0 // * x-10
54-9*x = 0
54-9*x = 0 // - 54
-9*x = -54 // : -9
x = -54/(-9)
x = 6
x = 6
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