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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
(-3*a)/a-6 = 6/a-10 // - 6/a-10
(-3*a)/a-(6/a)-6+10 = 0
(-3*a)/a-6*a^-1-6+10 = 0
-6*a^-1 = -1 // : -6
a^-1 = 1/6
-1 < 0
1/(a^1) = 1/6 // * a^1
1 = 1/6*a^1 // : 1/6
6 = a^1
a = 6
a = 6
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