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Simplifying x + x + 7 + 2(x + 7) = 129 Reorder the terms: x + x + 7 + 2(7 + x) = 129 x + x + 7 + (7 * 2 + x * 2) = 129 x + x + 7 + (14 + 2x) = 129 Reorder the terms: 7 + 14 + x + x + 2x = 129 Combine like terms: 7 + 14 = 21 21 + x + x + 2x = 129 Combine like terms: x + x = 2x 21 + 2x + 2x = 129 Combine like terms: 2x + 2x = 4x 21 + 4x = 129 Solving 21 + 4x = 129 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 4x = 129 + -21 Combine like terms: 21 + -21 = 0 0 + 4x = 129 + -21 4x = 129 + -21 Combine like terms: 129 + -21 = 108 4x = 108 Divide each side by '4'. x = 27 Simplifying x = 27
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