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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
4/a = 24/30 // - 24/30
4/a-(24/30) = 0
4/a-4/5 = 0
4*a^-1 = 4/5 // : 4
a^-1 = 1/5
-1 < 0
1/(a^1) = 1/5 // * a^1
1 = 1/5*a^1 // : 1/5
5 = a^1
a = 5
a = 5
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