Answer:
Simplifying
x + 3x = 240
Combine like terms: x + 3x = 4x
4x = 240
Solving
4x = 240
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Divide each side by '4'.
x = 60
Simplifying
x = 60
Step-by-step explanation:
