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Simplifying 9x + 21 + 2x = 3(3x + 9) Reorder the terms: 21 + 9x + 2x = 3(3x + 9) Combine like terms: 9x + 2x = 11x 21 + 11x = 3(3x + 9) Reorder the terms: 21 + 11x = 3(9 + 3x) 21 + 11x = (9 * 3 + 3x * 3) 21 + 11x = (27 + 9x) Solving 21 + 11x = 27 + 9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9x' to each side of the equation. 21 + 11x + -9x = 27 + 9x + -9x Combine like terms: 11x + -9x = 2x 21 + 2x = 27 + 9x + -9x Combine like terms: 9x + -9x = 0 21 + 2x = 27 + 0 21 + 2x = 27 Add '-21' to each side of the equation. 21 + -21 + 2x = 27 + -21 Combine like terms: 21 + -21 = 0 0 + 2x = 27 + -21 2x = 27 + -21 Combine like terms: 27 + -21 = 6 2x = 6 Divide each side by '2'. x = 3 Simplifying x = 3
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