To solve the equation \( ax + 3 = 12 \) for \( x \), follow these steps:
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Subtract 3 from both sides: \[ ax + 3 - 3 = 12 - 3 \] This simplifies to: \[ ax = 9 \]
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Now, divide both sides by \( a \): \[ x = \frac{9}{a} \]
So, the expression that \( x \) equals is: \[ x = \frac{9}{a} \]