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D( a )
a = 0
8*a = 0
a = 0
a = 0
8*a = 0
8*a = 0
8*a = 0 // : 8
a = 0
a in (-oo:0) U (0:+oo)
8/a-(5/8) = -(6/(8*a))-4/3 // + -(6/(8*a))-4/3
8/a+6/(8*a)-(5/8)-(-4/3) = 0
8/a+6/(8*a)-5/8+4/3 = 0
35/4*a^-1 = -17/24 // : 35/4
a^-1 = -17/210
-1 < 0
1/(a^1) = -17/210 // * a^1
1 = -17/210*a^1 // : -17/210
-210/17 = a^1
a = -210/17
a = -210/17
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