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Simplifying x + [x + 1] + [x + 2] = 66 Reorder the terms: x + [1 + x] + [x + 2] = 66 Remove brackets around [1 + x] x + 1 + x + [x + 2] = 66 Reorder the terms: x + 1 + x + [2 + x] = 66 Remove brackets around [2 + x] x + 1 + x + 2 + x = 66 Reorder the terms: 1 + 2 + x + x + x = 66 Combine like terms: 1 + 2 = 3 3 + x + x + x = 66 Combine like terms: x + x = 2x 3 + 2x + x = 66 Combine like terms: 2x + x = 3x 3 + 3x = 66 Solving 3 + 3x = 66 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + 3x = 66 + -3 Combine like terms: 3 + -3 = 0 0 + 3x = 66 + -3 3x = 66 + -3 Combine like terms: 66 + -3 = 63 3x = 63 Divide each side by '3'. x = 21 Simplifying x = 21
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