To solve for \( r \) in the equation \( 18 = 4r + 6 \), follow these steps:
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Subtract 6 from both sides of the equation:
\[ 18 - 6 = 4r \]
\[ 12 = 4r \]
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Now, divide both sides by 4:
\[ r = \frac{12}{4} \]
\[ r = 3 \]
So, the value of \( r \) is \( 3 \).