If you triple a number and then add 10, you get one-half of the original number. What is the number

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If you triple a number and then add 10, you get one-half of the original number. What is the number?

Let the number be n. We have:
3n + 10 = 0.5n

Subtract 0.5n from each side
2.5n + 10 = 0

Subtract 10 from each side:
2.5n = -10

Using our equation calculator, we get:
n = -4