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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
4/a+2 = 14/a-3 // - 14/a-3
4/a-(14/a)+2+3 = 0
4/a-14*a^-1+2+3 = 0
-10*a^-1 = -5 // : -10
a^-1 = 1/2
-1 < 0
1/(a^1) = 1/2 // * a^1
1 = 1/2*a^1 // : 1/2
2 = a^1
a = 2
a = 2
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