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D( a )
3*a = 0
3*a = 0
3*a = 0
3*a = 0 // : 3
a = 0
a in (-oo:0) U (0:+oo)
(a^2-36)/(3*a) = 0
1*a^2 = 36 // : 1
a^2 = 36
a^2 = 36 // ^ 1/2
abs(a) = 6
a = 6 or a = -6
a in { 6, -6 }
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