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Simplifying 129 + -5x = 4x + 21 Reorder the terms: 129 + -5x = 21 + 4x Solving 129 + -5x = 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 + -5x + -4x = 21 + 4x + -4x Combine like terms: -5x + -4x = -9x 129 + -9x = 21 + 4x + -4x Combine like terms: 4x + -4x = 0 129 + -9x = 21 + 0 129 + -9x = 21 Add '-129' to each side of the equation. 129 + -129 + -9x = 21 + -129 Combine like terms: 129 + -129 = 0 0 + -9x = 21 + -129 -9x = 21 + -129 Combine like terms: 21 + -129 = -108 -9x = -108 Divide each side by '-9'. x = 12 Simplifying x = 12
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