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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
5/a-2 = 4/a-1 // - 4/a-1
5/a-(4/a)-2+1 = 0
5/a-4*a^-1-2+1 = 0
1*a^-1 = 1 // : 1
a^-1 = 1
-1 < 0
1/(a^1) = 1 // * a^1
1 = 1*a^1 // : 1
1 = a^1
a = 1
a = 1
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