7/(a-9)=-2/(a+9)

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Solution for 7/(a-9)=-2/(a+9) equation: 


D( a )

a+9 = 0

a-9 = 0

a+9 = 0

a+9 = 0

a+9 = 0 // - 9

a = -9

a-9 = 0

a-9 = 0

a-9 = 0 // + 9

a = 9

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

7/(a-9) = -2/(a+9) // + -2/(a+9)

7/(a-9)-(-2/(a+9)) = 0

7/(a-9)+2*(a+9)^-1 = 0

7/(a-9)+2/(a+9) = 0

(7*(a+9))/((a-9)*(a+9))+(2*(a-9))/((a-9)*(a+9)) = 0

7*(a+9)+2*(a-9) = 0

9*a+45 = 0

(9*a+45)/((a-9)*(a+9)) = 0

(9*a+45)/((a-9)*(a+9)) = 0 // * (a-9)*(a+9)

9*a+45 = 0

9*a+45 = 0 // - 45

9*a = -45 // : 9

a = -45/9

a = -5

a = -5

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