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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
12/a+3.35 = 8.75 // - 8.75
12/a-8.75+3.35 = 0
12*a^-1 = 5.4 // : 12
a^-1 = 0.45
-1 < 0
1/(a^1) = 0.45 // * a^1
1 = 0.45*a^1 // : 0.45
2.22222222 = a^1
a = 2.22222222
a = 2.22222222
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