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D( x )
x+2 = 0
x+2 = 0
x+2 = 0
x+2 = 0 // - 2
x = -2
x in (-oo:-2) U (-2:+oo)
((1-(8*x))/(x+2))*(x-14) = 0
((1-8*x)/(x+2))*(x-14) = 0
((1-8*x)*(x-14))/(x+2) = 0
( 1-8*x )
1-8*x = 0 // - 1
-8*x = -1 // : -8
x = -1/(-8)
x = 1/8
( x-14 )
x-14 = 0 // + 14
x = 14
x in { 1/8, 14 }
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