To solve the equation \(10x + 13 = -12\), we proceed with the following steps:
- Subtract 13 from both sides of the equation:
\[ 10x + 13 - 13 = -12 - 13 \]
This simplifies to:
\[ 10x = -25 \]
- Divide both sides of the equation by 10:
\[ x = \frac{-25}{10} \]
This can be simplified to:
\[ x = \frac{-5}{2} \]
Thus, filling in the blanks:
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\(10x = -25\)
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\(x = \frac{-25}{10}\) (or simplified, you can also enter \(x = \frac{-5}{2}\)).
So, the completed solution is:
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\(10x = -25\)
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\(x = \frac{-25}{10}\) or \(x = \frac{-5}{2}\).