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Simplifying 1200 + x = 2(400 + x) 1200 + x = (400 * 2 + x * 2) 1200 + x = (800 + 2x) Solving 1200 + x = 800 + 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. 1200 + x + -2x = 800 + 2x + -2x Combine like terms: x + -2x = -1x 1200 + -1x = 800 + 2x + -2x Combine like terms: 2x + -2x = 0 1200 + -1x = 800 + 0 1200 + -1x = 800 Add '-1200' to each side of the equation. 1200 + -1200 + -1x = 800 + -1200 Combine like terms: 1200 + -1200 = 0 0 + -1x = 800 + -1200 -1x = 800 + -1200 Combine like terms: 800 + -1200 = -400 -1x = -400 Divide each side by '-1'. x = 400 Simplifying x = 400
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