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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
7.4/a = 14.8/2 // - 14.8/2
7.4/a-(14.8/2) = 0
7.4/a-7.4 = 0
7.4*a^-1 = 7.4 // : 7.4
a^-1 = 1
-1 < 0
1/(a^1) = 1 // * a^1
1 = 1*a^1 // : 1
1 = a^1
a = 1
a = 1
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