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Simplifying (9 + n) * x = 21x Reorder the terms for easier multiplication: x(9 + n) = 21x (9 * x + n * x) = 21x Reorder the terms: (nx + 9x) = 21x (nx + 9x) = 21x Solving nx + 9x = 21x Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-9x' to each side of the equation. nx + 9x + -9x = 21x + -9x Combine like terms: 9x + -9x = 0 nx + 0 = 21x + -9x nx = 21x + -9x Combine like terms: 21x + -9x = 12x nx = 12x Divide each side by 'x'. n = 12 Simplifying n = 12
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