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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
-((2*a)/a+20) = 4/a-16 // - 4/a-16
16-(4/a)-((2*a)/a)-20 = 0
16-4*a^-1-20-2 = 0
-4*a^-1 = 6 // : -4
a^-1 = -3/2
-1 < 0
1/(a^1) = -3/2 // * a^1
1 = -3/2*a^1 // : -3/2
-2/3 = a^1
a = -2/3
a = -2/3
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