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Simplifying 3x + 3(x + 12) = 126 Reorder the terms: 3x + 3(12 + x) = 126 3x + (12 * 3 + x * 3) = 126 3x + (36 + 3x) = 126 Reorder the terms: 36 + 3x + 3x = 126 Combine like terms: 3x + 3x = 6x 36 + 6x = 126 Solving 36 + 6x = 126 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-36' to each side of the equation. 36 + -36 + 6x = 126 + -36 Combine like terms: 36 + -36 = 0 0 + 6x = 126 + -36 6x = 126 + -36 Combine like terms: 126 + -36 = 90 6x = 90 Divide each side by '6'. x = 15 Simplifying x = 15
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