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Simplifying (x + 15) + (x + 30) + (x + 45) + (x + 60) + (x + 75) + (x) = 720 Reorder the terms: (15 + x) + (x + 30) + (x + 45) + (x + 60) + (x + 75) + (x) = 720 Remove parenthesis around (15 + x) 15 + x + (x + 30) + (x + 45) + (x + 60) + (x + 75) + (x) = 720 Reorder the terms: 15 + x + (30 + x) + (x + 45) + (x + 60) + (x + 75) + (x) = 720 Remove parenthesis around (30 + x) 15 + x + 30 + x + (x + 45) + (x + 60) + (x + 75) + (x) = 720 Reorder the terms: 15 + x + 30 + x + (45 + x) + (x + 60) + (x + 75) + (x) = 720 Remove parenthesis around (45 + x) 15 + x + 30 + x + 45 + x + (x + 60) + (x + 75) + (x) = 720 Reorder the terms: 15 + x + 30 + x + 45 + x + (60 + x) + (x + 75) + (x) = 720 Remove parenthesis around (60 + x) 15 + x + 30 + x + 45 + x + 60 + x + (x + 75) + (x) = 720 Reorder the terms: 15 + x + 30 + x + 45 + x + 60 + x + (75 + x) + (x) = 720 Remove parenthesis around (75 + x) 15 + x + 30 + x + 45 + x + 60 + x + 75 + x + (x) = 720 15 + x + 30 + x + 45 + x + 60 + x + 75 + x + x = 720 Reorder the terms: 15 + 30 + 45 + 60 + 75 + x + x + x + x + x + x = 720 Combine like terms: 15 + 30 = 45 45 + 45 + 60 + 75 + x + x + x + x + x + x = 720 Combine like terms: 45 + 45 = 90 90 + 60 + 75 + x + x + x + x + x + x = 720 Combine like terms: 90 + 60 = 150 150 + 75 + x + x + x + x + x + x = 720 Combine like terms: 150 + 75 = 225 225 + x + x + x + x + x + x = 720 Combine like terms: x + x = 2x 225 + 2x + x + x + x + x = 720 Combine like terms: 2x + x = 3x 225 + 3x + x + x + x = 720 Combine like terms: 3x + x = 4x 225 + 4x + x + x = 720 Combine like terms: 4x + x = 5x 225 + 5x + x = 720 Combine like terms: 5x + x = 6x 225 + 6x = 720 Solving 225 + 6x = 720 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-225' to each side of the equation. 225 + -225 + 6x = 720 + -225 Combine like terms: 225 + -225 = 0 0 + 6x = 720 + -225 6x = 720 + -225 Combine like terms: 720 + -225 = 495 6x = 495 Divide each side by '6'. x = 82.5 Simplifying x = 82.5
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