13=-65/a

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Solution for 13=-65/a equation: 


D( a )

a = 0

a = 0

a = 0

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

13 = -65/a // + -65/a

13-(-65/a) = 0

65*a^-1+13 = 0

65*a^-1 = -13 // : 65

a^-1 = -1/5

-1 < 0

1/(a^1) = -1/5 // * a^1

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

-5 = a^1

a = -5

a = -5

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