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Simplifying X + 60 + x + 60 + x + x = 400 Reorder the terms: 60 + 60 + X + x + x + x = 400 Combine like terms: 60 + 60 = 120 120 + X + x + x + x = 400 Combine like terms: x + x = 2x 120 + X + 2x + x = 400 Combine like terms: 2x + x = 3x 120 + X + 3x = 400 Solving 120 + X + 3x = 400 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-120' to each side of the equation. 120 + X + -120 + 3x = 400 + -120 Reorder the terms: 120 + -120 + X + 3x = 400 + -120 Combine like terms: 120 + -120 = 0 0 + X + 3x = 400 + -120 X + 3x = 400 + -120 Combine like terms: 400 + -120 = 280 X + 3x = 280 Add '-3x' to each side of the equation. X + 3x + -3x = 280 + -3x Combine like terms: 3x + -3x = 0 X + 0 = 280 + -3x X = 280 + -3x Simplifying X = 280 + -3x
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