To rewrite the equation \( 5y = 20x + 8 \) in terms of \( x \), Tilda needs to isolate \( x \).
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Start with the equation: \[ 5y = 20x + 8 \]
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Subtract \( 8 \) from both sides: \[ 5y - 8 = 20x \]
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Now, to isolate \( x \), divide both sides of the equation by \( 20 \): \[ x = \frac{5y - 8}{20} \]
So, the number she should divide both sides of the equation by in order to isolate \( x \) is 20.