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Simplifying 129 + -4x = 4x + 9 Reorder the terms: 129 + -4x = 9 + 4x Solving 129 + -4x = 9 + 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 + -4x = 9 + 4x + -4x Combine like terms: -4x + -4x = -8x 129 + -8x = 9 + 4x + -4x Combine like terms: 4x + -4x = 0 129 + -8x = 9 + 0 129 + -8x = 9 Add '-129' to each side of the equation. 129 + -129 + -8x = 9 + -129 Combine like terms: 129 + -129 = 0 0 + -8x = 9 + -129 -8x = 9 + -129 Combine like terms: 9 + -129 = -120 -8x = -120 Divide each side by '-8'. x = 15 Simplifying x = 15
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