Find all numbers that must be excluded from the domain of the rational expression 8/x+4?

Find all numbers that must be excluded from the domain of the rational expression.
8/x+4

max v2013-07-03T11:23:08Z

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all values of x are the domain. x is used to divide and division by 0 is not allowed. so x (the domain) can be all numbers except 0.

0 must be excluded