Final answer:
To write five more than three times a number equals 21 as a quotation, we set up the equation 3x + 5 = 21.
Step-by-step explanation:
To write five more than three times a number equals 21 as a quotation, we can use the variable x to represent the unknown number. So the expression 'three times a number' is 3x. And when we add five to that, we get 'five more than three times a number' as 3x + 5. Finally, if we set this expression equal to 21, we have the equation 3x + 5 = 21.
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