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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
-7/n-2 = 10 // - 10
-7/n-10-2 = 0
-7*n^-1 = 12 // : -7
n^-1 = -12/7
-1 < 0
1/(n^1) = -12/7 // * n^1
1 = -12/7*n^1 // : -12/7
-7/12 = n^1
n = -7/12
n = -7/12
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