To solve the equation \( 8x - 9 = 5x + 9 \), follow these steps:
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Isolate the variable on one side: Start by getting all terms containing \( x \) on one side and constant terms on the other side.
\[ 8x - 5x = 9 + 9 \]
Simplifying both sides gives:
\[ 3x = 18 \]
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Solve for \( x \): Divide both sides by 3.
\[ x = \frac{18}{3} = 6 \]
So, the solution to the equation \( 8x - 9 = 5x + 9 \) is:
\[ \boxed{6} \]