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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
28 = 7/s+10 // - 7/s+10
28-(7/s)-10 = 0
28-7*s^-1-10 = 0
-7*s^-1 = -18 // : -7
s^-1 = 18/7
-1 < 0
1/(s^1) = 18/7 // * s^1
1 = 18/7*s^1 // : 18/7
7/18 = s^1
s = 7/18
s = 7/18
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