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Simplifying x + 20 + 130 + x + 150 + x + -20 + 140 + 120 = 900 Reorder the terms: 20 + 130 + 150 + -20 + 140 + 120 + x + x + x = 900 Combine like terms: 20 + 130 = 150 150 + 150 + -20 + 140 + 120 + x + x + x = 900 Combine like terms: 150 + 150 = 300 300 + -20 + 140 + 120 + x + x + x = 900 Combine like terms: 300 + -20 = 280 280 + 140 + 120 + x + x + x = 900 Combine like terms: 280 + 140 = 420 420 + 120 + x + x + x = 900 Combine like terms: 420 + 120 = 540 540 + x + x + x = 900 Combine like terms: x + x = 2x 540 + 2x + x = 900 Combine like terms: 2x + x = 3x 540 + 3x = 900 Solving 540 + 3x = 900 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-540' to each side of the equation. 540 + -540 + 3x = 900 + -540 Combine like terms: 540 + -540 = 0 0 + 3x = 900 + -540 3x = 900 + -540 Combine like terms: 900 + -540 = 360 3x = 360 Divide each side by '3'. x = 120 Simplifying x = 120
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