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10-09-2020
Mathematics

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Seven more than twice a number is equal to 21. Find all the numbers that make this sentence is true.

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10-09-2020

x = a number

7 + 2x = 21

Subtract 7 from both sides

2x = 14

Divide both sides by 2

x = 7

7 is the only number that makes this sentence true.

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