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Simplifying 3x + 3(5x + 12) = 126 Reorder the terms: 3x + 3(12 + 5x) = 126 3x + (12 * 3 + 5x * 3) = 126 3x + (36 + 15x) = 126 Reorder the terms: 36 + 3x + 15x = 126 Combine like terms: 3x + 15x = 18x 36 + 18x = 126 Solving 36 + 18x = 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 + 18x = 126 + -36 Combine like terms: 36 + -36 = 0 0 + 18x = 126 + -36 18x = 126 + -36 Combine like terms: 126 + -36 = 90 18x = 90 Divide each side by '18'. x = 5 Simplifying x = 5
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