To solve the equation \( 3x - 3 = 6x + 18 \), we can start by isolating \( x \).
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First, let's get all the terms involving \( x \) on one side and the constant terms on the other side. We can do this by subtracting \( 3x \) from both sides:
\[ -3 = 6x - 3x + 18 \]
This simplifies to:
\[ -3 = 3x + 18 \]
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Next, we will isolate the term with \( x \) by subtracting \( 18 \) from both sides:
\[ -3 - 18 = 3x \]
This simplifies to:
\[ -21 = 3x \]
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Now, divide both sides by \( 3 \) to solve for \( x \):
\[ x = \frac{-21}{3} \]
This simplifies to:
\[ x = -7 \]
The solution is \( x = -7 \).
Therefore, the correct response is \( x = -7 \).