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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
25 = 150/a // - 150/a
25-(150/a) = 0
25-150*a^-1 = 0
-150*a^-1 = -25 // : -150
a^-1 = 1/6
-1 < 0
1/(a^1) = 1/6 // * a^1
1 = 1/6*a^1 // : 1/6
6 = a^1
a = 6
a = 6
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