Find all values of the variable x for which the rational expression is undefined 3x 5 x 12x 20 The expression is undefined when x If there is more than one answer, write it as a list, using commas to separate your answers

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Find all values of the variable x for which the rational expression is undefined. 3x + 5 / x + 12x + 20 The expression

Find all values of the variable x for which the rational expression is undefined. 3x + 5 / x² + 12x + 20 The expression is undefined when x = If there is more than one answer, write it as a list, using commas to separate your answers.

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