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Simplifying X + [x + 1] + [x + 2] + [x + 3] = 18 Reorder the terms: X + [1 + x] + [x + 2] + [x + 3] = 18 Remove brackets around [1 + x] X + 1 + x + [x + 2] + [x + 3] = 18 Reorder the terms: X + 1 + x + [2 + x] + [x + 3] = 18 Remove brackets around [2 + x] X + 1 + x + 2 + x + [x + 3] = 18 Reorder the terms: X + 1 + x + 2 + x + [3 + x] = 18 Remove brackets around [3 + x] X + 1 + x + 2 + x + 3 + x = 18 Reorder the terms: 1 + 2 + 3 + X + x + x + x = 18 Combine like terms: 1 + 2 = 3 3 + 3 + X + x + x + x = 18 Combine like terms: 3 + 3 = 6 6 + X + x + x + x = 18 Combine like terms: x + x = 2x 6 + X + 2x + x = 18 Combine like terms: 2x + x = 3x 6 + X + 3x = 18 Solving 6 + X + 3x = 18 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + X + -6 + 3x = 18 + -6 Reorder the terms: 6 + -6 + X + 3x = 18 + -6 Combine like terms: 6 + -6 = 0 0 + X + 3x = 18 + -6 X + 3x = 18 + -6 Combine like terms: 18 + -6 = 12 X + 3x = 12 Add '-3x' to each side of the equation. X + 3x + -3x = 12 + -3x Combine like terms: 3x + -3x = 0 X + 0 = 12 + -3x X = 12 + -3x Simplifying X = 12 + -3x
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