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Simplifying 441 = 2x + 9(2x + 9) Reorder the terms: 441 = 2x + 9(9 + 2x) 441 = 2x + (9 * 9 + 2x * 9) 441 = 2x + (81 + 18x) Reorder the terms: 441 = 81 + 2x + 18x Combine like terms: 2x + 18x = 20x 441 = 81 + 20x Solving 441 = 81 + 20x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-20x' to each side of the equation. 441 + -20x = 81 + 20x + -20x Combine like terms: 20x + -20x = 0 441 + -20x = 81 + 0 441 + -20x = 81 Add '-441' to each side of the equation. 441 + -441 + -20x = 81 + -441 Combine like terms: 441 + -441 = 0 0 + -20x = 81 + -441 -20x = 81 + -441 Combine like terms: 81 + -441 = -360 -20x = -360 Divide each side by '-20'. x = 18 Simplifying x = 18
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