To solve the equation \(-3x - 9 = -21\), we can follow the steps outlined in your question.
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Start with the original equation: \(-3x - 9 = -21\)
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Add 9 to both sides: \(-3x = -21 + 9\) \(-3x = -12\)
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Divide both sides by \(-3\): \(x = \frac{-12}{-3}\) \(x = 4\)
So, filling in the blanks:
- For \(-3x = ____\): The answer is \(-12\).
- For \(x = ____\): The answer is \(4\).
Thus, the completed solution is:
- \(-3x = -12\)
- \(x = 4\)