9/(5-7z)

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Solution for 9/(5-7z) equation: 


D( z )

5-(7*z) = 0

5-(7*z) = 0

5-(7*z) = 0

5-7*z = 0

5-7*z = 0 // - 5

-7*z = -5 // : -7

z = -5/(-7)

z = 5/7

z in (-oo:5/7) U (5/7:+oo)

9/(5-(7*z)) = 0

9/(5-7*z) = 0

z belongs to the empty set

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