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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
12/7.5 = 8/s // - 8/s
12/7.5-(8/s) = 0
12/7.5-8*s^-1 = 0
-8*s^-1 = -1.6 // : -8
s^-1 = 0.2
-1 < 0
1/(s^1) = 0.2 // * s^1
1 = 0.2*s^1 // : 0.2
5 = s^1
s = 5
s = 5
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