To solve the equation \( \frac{3}{4} = \frac{x}{12} \), you can use cross-multiplication.
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Cross-multiply: \[ 3 \cdot 12 = 4 \cdot x \] This simplifies to: \[ 36 = 4x \]
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Next, solve for \( x \) by dividing both sides by 4: \[ x = \frac{36}{4} = 9 \]
So, the solution is \( x = 9 \).