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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
4/a+3/a+2 = 0
7*a^-1 = -2 // : 7
a^-1 = -2/7
-1 < 0
1/(a^1) = -2/7 // * a^1
1 = -2/7*a^1 // : -2/7
-7/2 = a^1
a = -7/2
a = -7/2
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