9/12=15/a

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Solution for 9/12=15/a equation: 


D( a )

a = 0

a = 0

a = 0

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

9/12 = 15/a // - 15/a

9/12-(15/a) = 0

9/12-15*a^-1 = 0

-15*a^-1 = -3/4 // : -15

a^-1 = 1/20

-1 < 0

1/(a^1) = 1/20 // * a^1

1 = 1/20*a^1 // : 1/20

20 = a^1

a = 20

a = 20

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