To solve the equation \( \frac{1}{4}(x+3) = 5 \), let's go through each step:
Step 1: Multiply both sides by 4 to eliminate the fraction.
\[ 4 \cdot \frac{1}{4}(x+3) = 4 \cdot 5 \]
This results in:
\[ (x + 3) = 20 \]
Step 2: The equation now is:
\[ x + 3 = 20 \]
Step 3: Subtract 3 from both sides:
\[ x + 3 - 3 = 20 - 3 \]
This results in:
\[ x = 17 \]
So, filling in the blanks:
Step 1: (4) \( \frac{1}{4}(x+3) = 5 \) (4)
Step 2: \( x + 3 = \textbf{20} \)
Step 3: Subtract 3 from both sides.