(z^2-25)(z+7)/(9z-63)(z-5)

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Solution for (z^2-25)(z+7)/(9z-63)(z-5) equation: 


D( z )

9*z-63 = 0

9*z-63 = 0

9*z-63 = 0

9*z-63 = 0 // + 63

9*z = 63 // : 9

z = 63/9

z = 7

z in (-oo:7) U (7:+oo)

(((z^2-25)*(z+7))/(9*z-63))*(z-5) = 0

((z^2-25)*(z+7)*(z-5))/(9*z-63) = 0

( z+7 )

z+7 = 0 // - 7

z = -7

( z-5 )

z-5 = 0 // + 5

z = 5

( z^2-25 )

1*z^2 = 25 // : 1

z^2 = 25

z^2 = 25 // ^ 1/2

abs(z) = 5

z = 5 or z = -5

z in { -7, 5, 5, -5 }

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