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Simplifying 3x + x + (80 + x) = 455 Remove parenthesis around (80 + x) 3x + x + 80 + x = 455 Reorder the terms: 80 + 3x + x + x = 455 Combine like terms: 3x + x = 4x 80 + 4x + x = 455 Combine like terms: 4x + x = 5x 80 + 5x = 455 Solving 80 + 5x = 455 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-80' to each side of the equation. 80 + -80 + 5x = 455 + -80 Combine like terms: 80 + -80 = 0 0 + 5x = 455 + -80 5x = 455 + -80 Combine like terms: 455 + -80 = 375 5x = 375 Divide each side by '5'. x = 75 Simplifying x = 75
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