5. Two times of a number decreased by 10 is equals to 22. Find the number.
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Answer:
Let the number be x.
twice =2x
When it is decreased by 7 we get the following equation:
2x−7=45
⇒2x=45+7
⇒2x=52
⇒x=
2
52
∴x=26
The number is 26.
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