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Simplifying -21 = 3(n + 3) Reorder the terms: -21 = 3(3 + n) -21 = (3 * 3 + n * 3) -21 = (9 + 3n) Solving -21 = 9 + 3n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-3n' to each side of the equation. -21 + -3n = 9 + 3n + -3n Combine like terms: 3n + -3n = 0 -21 + -3n = 9 + 0 -21 + -3n = 9 Add '21' to each side of the equation. -21 + 21 + -3n = 9 + 21 Combine like terms: -21 + 21 = 0 0 + -3n = 9 + 21 -3n = 9 + 21 Combine like terms: 9 + 21 = 30 -3n = 30 Divide each side by '-3'. n = -10 Simplifying n = -10
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