Fill in the blank.
$(- 9) -___= 18$

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Solution

Let $x$ be the integer in the blank, then
$(- 9) - x = 18$
Adding $9$ to both sides, we get
$(- 9) - x + 9 = 18 + 9$
$\Rightarrow - x = 27$
Multiplying both sides with $-$ sign, we get
$x = - 27$
Hence, $- 27$ is the required answer.

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