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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)
(2-(7*x))/(x+5) = 0
(2-7*x)/(x+5) = 0
2-7*x = 0 // - 2
-7*x = -2 // : -7
x = -2/(-7)
x = 2/7
x = 2/7
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