x + 3x = 180

To solve the equation \( x + 3x = 180 \), we first combine like terms:

\[ 4x = 180 \]

Next, we divide both sides by 4 to isolate \( x \):

\[ x = \frac{180}{4} \] \[ x = 45 \]

So, the solution is \( x = 45 \).