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