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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
4 = 148/a // - 148/a
4-(148/a) = 0
4-148*a^-1 = 0
-148*a^-1 = -4 // : -148
a^-1 = 1/37
-1 < 0
1/(a^1) = 1/37 // * a^1
1 = 1/37*a^1 // : 1/37
37 = a^1
a = 37
a = 37
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