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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
1/6-(3/4) = 1/a // - 1/a
1/6-(1/a)-(3/4) = 0
1/6-a^-1-3/4 = 0
-1*a^-1 = 7/12 // : -1
a^-1 = -7/12
-1 < 0
1/(a^1) = -7/12 // * a^1
1 = -7/12*a^1 // : -7/12
-12/7 = a^1
a = -12/7
a = -12/7
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