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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
7/a = 35/60 // - 35/60
7/a-(35/60) = 0
7/a-7/12 = 0
7*a^-1 = 7/12 // : 7
a^-1 = 1/12
-1 < 0
1/(a^1) = 1/12 // * a^1
1 = 1/12*a^1 // : 1/12
12 = a^1
a = 12
a = 12
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