2 Answers

Toddsundsted · Answer 1 · 2019-10-18T14:02:01+0000

Let the number be x.

Four times a number is 21 more than the number
⇒ 4x = 21 + x

Solve x:
4x = 21 + x

Subtract x from both sides:
3x = 21

Divide both sides by 3:
x = 7

Answer: The number is 7.

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