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If $\sqrt{100-x}=9$, what is the value of $x$?

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A number or a short expression. Fractions can be typed as 3/2, and spacing doesn't matter.

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Official solution

Since $\sqrt{100-x}=9$, then $100-x=9^{2}=81$, and so $x=100-81=19$.

Source: Omni-MATH, licensed Apache-2.0. Statement reproduced verbatim; metadata (topic, difficulty, ordering) added by this project.