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D( n )
n+7 = 0
n+7 = 0
n+7 = 0
n+7 = 0 // - 7
n = -7
n in (-oo:-7) U (-7:+oo)
(n-2)/(n+7) = 4/3 // - 4/3
(n-2)/(n+7)-(4/3) = 0
(n-2)/(n+7)-4/3 = 0
(3*(n-2))/(3*(n+7))+(-4*(n+7))/(3*(n+7)) = 0
3*(n-2)-4*(n+7) = 0
-n-34 = 0
(-n-34)/(3*(n+7)) = 0
(-n-34)/(3*(n+7)) = 0 // * 3*(n+7)
-n-34 = 0
-n-34 = 0 // + 34
-n = 34 // * -1
n = -34
n = -34
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