(-2/9)=4/a

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Solution for (-2/9)=4/a equation: 


D( a )

a = 0

a = 0

a = 0

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

-2/9 = 4/a // - 4/a

-(4/a)-2/9 = 0

-4*a^-1-2/9 = 0

-4*a^-1 = 2/9 // : -4

a^-1 = -1/18

-1 < 0

1/(a^1) = -1/18 // * a^1

1 = -1/18*a^1 // : -1/18

-18 = a^1

a = -18

a = -18

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