3/(-7-x)

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Solution for 3/(-7-x) equation: 


D( x )

-x-7 = 0

-x-7 = 0

-x-7 = 0

-x-7 = 0 // + 7

-x = 7 // * -1

x = -7

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

3/(-x-7) = 0

x belongs to the empty set

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