Let the original price of the furniture be \( x \).
After a 20% reduction, the price is 80% of the original price. Therefore, we can write the following equation:
\[ 0.80x = 3520 \]
To find the original price \( x \), we can divide both sides of the equation by 0.80:
\[ x = \frac{3520}{0.80} \]
Calculating this:
\[ x = 4400 \]
Thus, the original price of the furniture before the discount was 4400.