To rewrite the equation \(5y = 20x + 8\) in terms of \(x\), we start by subtracting 8 from both sides:
\[ 5y - 8 = 20x \]
Next, we want to isolate \(x\). To do this, we need to divide both sides of the equation by \(20\) (the coefficient of \(x\)):
\[ x = \frac{5y - 8}{20} \]
So, after subtracting 8 from both sides, Tilda should divide both sides of the equation by \(20\) in order to solve for \(x\).