Evans dog weighs 63 pounds. Oxanas dog weighs 9 pounds. How much more does evan’s dog weigh than oxanas dog?
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now, for a rational expression, the domain, or "values that x can safely take", applies to the denominator NOT becoming 0, because if the denominator is 0, then the rational turns to undefined.
now, what value of "x" makes this denominator turn to 0, let's check by setting it to 0 then.
so, the domain is all real numbers EXCEPT that one.