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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
2/34 = 5/a // - 5/a
2/34-(5/a) = 0
2/34-5*a^-1 = 0
-5*a^-1 = -1/17 // : -5
a^-1 = 1/85
-1 < 0
1/(a^1) = 1/85 // * a^1
1 = 1/85*a^1 // : 1/85
85 = a^1
a = 85
a = 85
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