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Simplifying (x + -30) + x + (x + -30) + x + (x + -30) = 540 Reorder the terms: (-30 + x) + x + (x + -30) + x + (x + -30) = 540 Remove parenthesis around (-30 + x) -30 + x + x + (x + -30) + x + (x + -30) = 540 Reorder the terms: -30 + x + x + (-30 + x) + x + (x + -30) = 540 Remove parenthesis around (-30 + x) -30 + x + x + -30 + x + x + (x + -30) = 540 Reorder the terms: -30 + x + x + -30 + x + x + (-30 + x) = 540 Remove parenthesis around (-30 + x) -30 + x + x + -30 + x + x + -30 + x = 540 Reorder the terms: -30 + -30 + -30 + x + x + x + x + x = 540 Combine like terms: -30 + -30 = -60 -60 + -30 + x + x + x + x + x = 540 Combine like terms: -60 + -30 = -90 -90 + x + x + x + x + x = 540 Combine like terms: x + x = 2x -90 + 2x + x + x + x = 540 Combine like terms: 2x + x = 3x -90 + 3x + x + x = 540 Combine like terms: 3x + x = 4x -90 + 4x + x = 540 Combine like terms: 4x + x = 5x -90 + 5x = 540 Solving -90 + 5x = 540 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '90' to each side of the equation. -90 + 90 + 5x = 540 + 90 Combine like terms: -90 + 90 = 0 0 + 5x = 540 + 90 5x = 540 + 90 Combine like terms: 540 + 90 = 630 5x = 630 Divide each side by '5'. x = 126 Simplifying x = 126
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