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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
(-3*a)/a-(6/a)-8+4 = 0
(-3*a)/a-6*a^-1-8+4 = 0
-6*a^-1 = 7 // : -6
a^-1 = -7/6
-1 < 0
1/(a^1) = -7/6 // * a^1
1 = -7/6*a^1 // : -7/6
-6/7 = a^1
a = -6/7
a = -6/7
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