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D( x )
3*x-216 = 0
3*x-216 = 0
3*x-216 = 0
3*x-216 = 0 // + 216
3*x = 216 // : 3
x = 216/3
x = 72
x in (-oo:72) U (72:+oo)
(2*x-10)/(3*x-216) = 0
2*x-10 = 0 // + 10
2*x = 10 // : 2
x = 10/2
x = 5
x = 5
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