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Write an algebraic expression and solve it. A number decreased by $10$ is twice the number.
Given: A number decreased by $10$ is twice the number.
To do: To write an algebraic expression and solve it.
Solution:
Let $x$ be the number. According to the question
$x-10=2x$
$\Rightarrow x-2x=10$
$\Rightarrow x=-10$
Thus, the number is $-10$.
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