X+x-400+x-500=1200как решить?

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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.