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The difference between three times a number and 21 is three.what is the number?
Wiki User
∙ 14y ago
The answer is 8.
In showing my work:
3(x) - 21 = 3 is the equation setting up the problem.
Then you want to isolate (x) on one side of the equation.
To do so you first have to eliminate the 21 from the left side by adding 21 to each side.
3(x) - 21 + 21 = 3 + 21. Therefore, 3(x) = 24.
Now in order to solely isolate (x), you must divide each side by 3.
3(x)/3 = 24/3. Therefore, x = 8. That is your answer.
Wiki User
∙ 14y ago
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