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Simplifying 129 = x + 2x + (x + 29) Reorder the terms: 129 = x + 2x + (29 + x) Remove parenthesis around (29 + x) 129 = x + 2x + 29 + x Reorder the terms: 129 = 29 + x + 2x + x Combine like terms: x + 2x = 3x 129 = 29 + 3x + x Combine like terms: 3x + x = 4x 129 = 29 + 4x Solving 129 = 29 + 4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4x' to each side of the equation. 129 + -4x = 29 + 4x + -4x Combine like terms: 4x + -4x = 0 129 + -4x = 29 + 0 129 + -4x = 29 Add '-129' to each side of the equation. 129 + -129 + -4x = 29 + -129 Combine like terms: 129 + -129 = 0 0 + -4x = 29 + -129 -4x = 29 + -129 Combine like terms: 29 + -129 = -100 -4x = -100 Divide each side by '-4'. x = 25 Simplifying x = 25
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