Check if this value of x satisfies the given equation. Substitute \( \mathrm{x}=15 \) \[ \begin{aligned} 4 \mathrm{x} & =60 \\ 4 \cdot \square & =60\end{aligned} \]

First, let's plug in the value of \( \mathrm{x} = 15 \) into the equation. We have: \[ 4 \cdot 15 = 60 \] Calculating that gives: \[ 60 = 60 \] This proves that substituting \( \mathrm{x} = 15 \) satisfies the equation. So, we’re good to go! Now, just a quick note: when testing values in equations, be sure to perform the arithmetic correctly. Common mistakes include overlooking order of operations or simple calculation errors. It's always a good idea to double-check the math to avoid any embarrassing slips!