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Simplifying 6x + 3(3x + 3) = 129 Reorder the terms: 6x + 3(3 + 3x) = 129 6x + (3 * 3 + 3x * 3) = 129 6x + (9 + 9x) = 129 Reorder the terms: 9 + 6x + 9x = 129 Combine like terms: 6x + 9x = 15x 9 + 15x = 129 Solving 9 + 15x = 129 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + 15x = 129 + -9 Combine like terms: 9 + -9 = 0 0 + 15x = 129 + -9 15x = 129 + -9 Combine like terms: 129 + -9 = 120 15x = 120 Divide each side by '15'. x = 8 Simplifying x = 8
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