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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
18.6/a = 7.5 // - 7.5
18.6/a-7.5 = 0
18.6*a^-1 = 7.5 // : 18.6
a^-1 = 0.40322581
-1 < 0
1/(a^1) = 0.40322581 // * a^1
1 = 0.40322581*a^1 // : 0.40322581
2.47999998 = a^1
a = 2.47999998
a = 2.47999998
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