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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
11/a = 7/8 // - 7/8
11/a-(7/8) = 0
11/a-7/8 = 0
11*a^-1 = 7/8 // : 11
a^-1 = 7/88
-1 < 0
1/(a^1) = 7/88 // * a^1
1 = 7/88*a^1 // : 7/88
88/7 = a^1
a = 88/7
a = 88/7
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