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Simplifying 21 + -3n = -3(3n + -3) Reorder the terms: 21 + -3n = -3(-3 + 3n) 21 + -3n = (-3 * -3 + 3n * -3) 21 + -3n = (9 + -9n) Solving 21 + -3n = 9 + -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 + -3n + 9n = 9 + -9n + 9n Combine like terms: -3n + 9n = 6n 21 + 6n = 9 + -9n + 9n Combine like terms: -9n + 9n = 0 21 + 6n = 9 + 0 21 + 6n = 9 Add '-21' to each side of the equation. 21 + -21 + 6n = 9 + -21 Combine like terms: 21 + -21 = 0 0 + 6n = 9 + -21 6n = 9 + -21 Combine like terms: 9 + -21 = -12 6n = -12 Divide each side by '6'. n = -2 Simplifying n = -2
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