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Five times some number is 10 less than the number.
What is the number?
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Let x be the number.
Five times some number is 10 less than the number.
Five times x is 10 less than x.
5 times x is 10 less than x.
5x is 10 less than x.
5x = 10 less than x.
5x = x lessened by 10.
5x = x - 10.
Can you solve that? Answer: x = -2.5
Edwin