SOLUTION: two times a number plus 1 is 21

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Question 104411: two times a number plus 1 is 21
Answer by HyperBrain(694) About Me  (Show Source):
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Let x=the number

two times a number=2x
And,
two times a number plus 1=2x+1
So,
two times a number plus 1 is 21
2x+1=21
2x=20
x=10
Therefore, the number is 10