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Simplifying X + (x + 1) + (x + 2) = -129 Reorder the terms: X + (1 + x) + (x + 2) = -129 Remove parenthesis around (1 + x) X + 1 + x + (x + 2) = -129 Reorder the terms: X + 1 + x + (2 + x) = -129 Remove parenthesis around (2 + x) X + 1 + x + 2 + x = -129 Reorder the terms: 1 + 2 + X + x + x = -129 Combine like terms: 1 + 2 = 3 3 + X + x + x = -129 Combine like terms: x + x = 2x 3 + X + 2x = -129 Solving 3 + X + 2x = -129 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 + X + -3 + 2x = -129 + -3 Reorder the terms: 3 + -3 + X + 2x = -129 + -3 Combine like terms: 3 + -3 = 0 0 + X + 2x = -129 + -3 X + 2x = -129 + -3 Combine like terms: -129 + -3 = -132 X + 2x = -132 Add '-2x' to each side of the equation. X + 2x + -2x = -132 + -2x Combine like terms: 2x + -2x = 0 X + 0 = -132 + -2x X = -132 + -2x Simplifying X = -132 + -2x
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