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Simplifying 129 = x + 2x + (x + 21) Reorder the terms: 129 = x + 2x + (21 + x) Remove parenthesis around (21 + x) 129 = x + 2x + 21 + x Reorder the terms: 129 = 21 + x + 2x + x Combine like terms: x + 2x = 3x 129 = 21 + 3x + x Combine like terms: 3x + x = 4x 129 = 21 + 4x Solving 129 = 21 + 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 = 21 + 4x + -4x Combine like terms: 4x + -4x = 0 129 + -4x = 21 + 0 129 + -4x = 21 Add '-129' to each side of the equation. 129 + -129 + -4x = 21 + -129 Combine like terms: 129 + -129 = 0 0 + -4x = 21 + -129 -4x = 21 + -129 Combine like terms: 21 + -129 = -108 -4x = -108 Divide each side by '-4'. x = 27 Simplifying x = 27
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