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Simplifying 3x + 9(2x + 3) = 42 Reorder the terms: 3x + 9(3 + 2x) = 42 3x + (3 * 9 + 2x * 9) = 42 3x + (27 + 18x) = 42 Reorder the terms: 27 + 3x + 18x = 42 Combine like terms: 3x + 18x = 21x 27 + 21x = 42 Solving 27 + 21x = 42 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-27' to each side of the equation. 27 + -27 + 21x = 42 + -27 Combine like terms: 27 + -27 = 0 0 + 21x = 42 + -27 21x = 42 + -27 Combine like terms: 42 + -27 = 15 21x = 15 Divide each side by '21'. x = 0.7142857143 Simplifying x = 0.7142857143
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