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Simplifying X + (3X + 3) = 129 Reorder the terms: X + (3 + 3X) = 129 Remove parenthesis around (3 + 3X) X + 3 + 3X = 129 Reorder the terms: 3 + X + 3X = 129 Combine like terms: X + 3X = 4X 3 + 4X = 129 Solving 3 + 4X = 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 + -3 + 4X = 129 + -3 Combine like terms: 3 + -3 = 0 0 + 4X = 129 + -3 4X = 129 + -3 Combine like terms: 129 + -3 = 126 4X = 126 Divide each side by '4'. X = 31.5 Simplifying X = 31.5
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