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Simplifying x + -640 + x = 1985 Reorder the terms: -640 + x + x = 1985 Combine like terms: x + x = 2x -640 + 2x = 1985 Solving -640 + 2x = 1985 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '640' to each side of the equation. -640 + 640 + 2x = 1985 + 640 Combine like terms: -640 + 640 = 0 0 + 2x = 1985 + 640 2x = 1985 + 640 Combine like terms: 1985 + 640 = 2625 2x = 2625 Divide each side by '2'. x = 1312.5 Simplifying x = 1312.5
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