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Simplifying 129 = 5x + 4(x + 12) Reorder the terms: 129 = 5x + 4(12 + x) 129 = 5x + (12 * 4 + x * 4) 129 = 5x + (48 + 4x) Reorder the terms: 129 = 48 + 5x + 4x Combine like terms: 5x + 4x = 9x 129 = 48 + 9x Solving 129 = 48 + 9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9x' to each side of the equation. 129 + -9x = 48 + 9x + -9x Combine like terms: 9x + -9x = 0 129 + -9x = 48 + 0 129 + -9x = 48 Add '-129' to each side of the equation. 129 + -129 + -9x = 48 + -129 Combine like terms: 129 + -129 = 0 0 + -9x = 48 + -129 -9x = 48 + -129 Combine like terms: 48 + -129 = -81 -9x = -81 Divide each side by '-9'. x = 9 Simplifying x = 9
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