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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
3.5/a = 1.5/0.3 // - 1.5/0.3
3.5/a-(1.5/0.3) = 0
3.5/a-5 = 0
3.5*a^-1 = 5 // : 3.5
a^-1 = 1.42857143
-1 < 0
1/(a^1) = 1.42857143 // * a^1
1 = 1.42857143*a^1 // : 1.42857143
0.7 = a^1
a = 0.7
a = 0.7
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