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Simplifying x + 400 = 3x Reorder the terms: 400 + x = 3x Solving 400 + x = 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. 400 + x + -3x = 3x + -3x Combine like terms: x + -3x = -2x 400 + -2x = 3x + -3x Combine like terms: 3x + -3x = 0 400 + -2x = 0 Add '-400' to each side of the equation. 400 + -400 + -2x = 0 + -400 Combine like terms: 400 + -400 = 0 0 + -2x = 0 + -400 -2x = 0 + -400 Combine like terms: 0 + -400 = -400 -2x = -400 Divide each side by '-2'. x = 200 Simplifying x = 200
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