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Simplifying 5x + 4(2x + 3) = 129 Reorder the terms: 5x + 4(3 + 2x) = 129 5x + (3 * 4 + 2x * 4) = 129 5x + (12 + 8x) = 129 Reorder the terms: 12 + 5x + 8x = 129 Combine like terms: 5x + 8x = 13x 12 + 13x = 129 Solving 12 + 13x = 129 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + 13x = 129 + -12 Combine like terms: 12 + -12 = 0 0 + 13x = 129 + -12 13x = 129 + -12 Combine like terms: 129 + -12 = 117 13x = 117 Divide each side by '13'. x = 9 Simplifying x = 9
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