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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
1.5/a = 480/120 // - 480/120
1.5/a-(480/120) = 0
1.5/a-4 = 0
1.5*a^-1 = 4 // : 1.5
a^-1 = 2.66666667
-1 < 0
1/(a^1) = 2.66666667 // * a^1
1 = 2.66666667*a^1 // : 2.66666667
0.375 = a^1
a = 0.375
a = 0.375
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