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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
250/a = 5 // - 5
250/a-5 = 0
250*a^-1 = 5 // : 250
a^-1 = 1/50
-1 < 0
1/(a^1) = 1/50 // * a^1
1 = 1/50*a^1 // : 1/50
50 = a^1
a = 50
a = 50
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