Fill in the blanks.
$15 + . . . . . . . . = 10$

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Solution

$15 + . . . . . . . . = 10$
Let $x$ be the unknown number here.
So,
$\begin{array}{rcl} 15 + x & = & 10 \\ x & = & 10 - 15 \\ x & = & - 5 \end{array}$
Hence, the answer is $- 5$

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