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You can solve this algebraically. Let n be a number.

20 - 2n = 50

20 = 50 + 2n

2n = -30

n = -15

The number is -15

Verify: 20 - 2(-15) = 20 + 30 = 50

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Q: What is a number such that 20 less than twice a number is 50?
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