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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
5/8 = 75/a // - 75/a
5/8-(75/a) = 0
5/8-75*a^-1 = 0
-75*a^-1 = -5/8 // : -75
a^-1 = 1/120
-1 < 0
1/(a^1) = 1/120 // * a^1
1 = 1/120*a^1 // : 1/120
120 = a^1
a = 120
a = 120
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