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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
1000/40 = 700/n // - 700/n
1000/40-(700/n) = 0
1000/40-700*n^-1 = 0
-700*n^-1 = -25 // : -700
n^-1 = 1/28
-1 < 0
1/(n^1) = 1/28 // * n^1
1 = 1/28*n^1 // : 1/28
28 = n^1
n = 28
n = 28
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