(15-5a)/(-9-5a)

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Solution for (15-5a)/(-9-5a) equation: 


D( a )

-(5*a)-9 = 0

-(5*a)-9 = 0

-(5*a)-9 = 0

-5*a-9 = 0

-5*a-9 = 0 // + 9

-5*a = 9 // : -5

a = 9/(-5)

a = -9/5

a in (-oo:-9/5) U (-9/5:+oo)

(15-(5*a))/(-(5*a)-9) = 0

(15-5*a)/(-5*a-9) = 0

15-5*a = 0 // - 15

-5*a = -15 // : -5

a = -15/(-5)

a = 3

a = 3

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