To solve for the blank in the equation \(40 - __ = 30\), you can rearrange the equation:
\[ 40 - 30 = __ \]
This simplifies to:
\[ 10 = __ \]
So, the blank should be filled with 10. The complete equation is:
\(40 - 10 = 30\).
40- ____________=30
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