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Simplifying 21 = 4 + 9n Solving 21 = 4 + 9n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-9n' to each side of the equation. 21 + -9n = 4 + 9n + -9n Combine like terms: 9n + -9n = 0 21 + -9n = 4 + 0 21 + -9n = 4 Add '-21' to each side of the equation. 21 + -21 + -9n = 4 + -21 Combine like terms: 21 + -21 = 0 0 + -9n = 4 + -21 -9n = 4 + -21 Combine like terms: 4 + -21 = -17 -9n = -17 Divide each side by '-9'. n = 1.888888889 Simplifying n = 1.888888889
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