To solve the equation \( \frac{4x}{9} = 18 \), you can follow these steps:
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Multiply both sides by 9 to eliminate the fraction:
\[ 4x = 18 \times 9 \]
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Calculate \( 18 \times 9 \):
\[ 18 \times 9 = 162 \]
So the equation becomes:
\[ 4x = 162 \]
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Now, divide both sides by 4 to solve for \( x \):
\[ x = \frac{162}{4} \]
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Simplify \( \frac{162}{4} \):
\[ x = 40.5 \]
Thus, the solution is \( x = 40.5 \).
The correct response is 40.5.