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Simplifying 130 + 140 + 115 + x + 90 + 130 + x + 65 + x + 80 = 900 Reorder the terms: 130 + 140 + 115 + 90 + 130 + 65 + 80 + x + x + x = 900 Combine like terms: 130 + 140 = 270 270 + 115 + 90 + 130 + 65 + 80 + x + x + x = 900 Combine like terms: 270 + 115 = 385 385 + 90 + 130 + 65 + 80 + x + x + x = 900 Combine like terms: 385 + 90 = 475 475 + 130 + 65 + 80 + x + x + x = 900 Combine like terms: 475 + 130 = 605 605 + 65 + 80 + x + x + x = 900 Combine like terms: 605 + 65 = 670 670 + 80 + x + x + x = 900 Combine like terms: 670 + 80 = 750 750 + x + x + x = 900 Combine like terms: x + x = 2x 750 + 2x + x = 900 Combine like terms: 2x + x = 3x 750 + 3x = 900 Solving 750 + 3x = 900 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-750' to each side of the equation. 750 + -750 + 3x = 900 + -750 Combine like terms: 750 + -750 = 0 0 + 3x = 900 + -750 3x = 900 + -750 Combine like terms: 900 + -750 = 150 3x = 150 Divide each side by '3'. x = 50 Simplifying x = 50
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