(a/7a^3)/(a^2/21)

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Solution for (a/7a^3)/(a^2/21) equation: 


D( a )

(a^2)/21 = 0

(a^2)/21 = 0

(a^2)/21 = 0

1/21*a^2 = 0 // : 1/21

a^2 = 0

a = 0

a in (-oo:0) U (0:+oo)

((a/7)*a^3)/((a^2)/21) = 0

3*a^2 = 0 // : 3

a^2 = 0

a = 0

a in { 0} 

a belongs to the empty set

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