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Simplifying x + 400 = 2x Reorder the terms: 400 + x = 2x Solving 400 + x = 2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2x' to each side of the equation. 400 + x + -2x = 2x + -2x Combine like terms: x + -2x = -1x 400 + -1x = 2x + -2x Combine like terms: 2x + -2x = 0 400 + -1x = 0 Add '-400' to each side of the equation. 400 + -400 + -1x = 0 + -400 Combine like terms: 400 + -400 = 0 0 + -1x = 0 + -400 -1x = 0 + -400 Combine like terms: 0 + -400 = -400 -1x = -400 Divide each side by '-1'. x = 400 Simplifying x = 400
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