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D( x )
x+3 = 0
x+3 = 0
x+3 = 0
x+3 = 0 // - 3
x = -3
x in (-oo:-3) U (-3:+oo)
(3/(x+3))*(x-15) = 0
(3*(x-15))/(x+3) = 0
x-15 = 0 // + 15
x = 15
x = 15
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