To solve this equation, combine like terms on the left hand side:
X + X - 400 + X - 500 = 12003X - 900 = 1200
Next, add 900 to both sides of the equation:
3X = 2100
Finally, divide by 3:
X = 700
Therefore, the solution to the equation is X = 700.
To solve this equation, combine like terms on the left hand side:
X + X - 400 + X - 500 = 1200
3X - 900 = 1200
Next, add 900 to both sides of the equation:
3X = 2100
Finally, divide by 3:
X = 700
Therefore, the solution to the equation is X = 700.