18/15=9/a

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Solution for 18/15=9/a equation: 


D( a )

a = 0

a = 0

a = 0

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

18/15 = 9/a // - 9/a

18/15-(9/a) = 0

18/15-9*a^-1 = 0

-9*a^-1 = -6/5 // : -9

a^-1 = 2/15

-1 < 0

1/(a^1) = 2/15 // * a^1

1 = 2/15*a^1 // : 2/15

15/2 = a^1

a = 15/2

a = 15/2

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