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Simplifying 21 + -3n = 7(3 + -2n) 21 + -3n = (3 * 7 + -2n * 7) 21 + -3n = (21 + -14n) Add '-21' to each side of the equation. 21 + -21 + -3n = 21 + -21 + -14n Combine like terms: 21 + -21 = 0 0 + -3n = 21 + -21 + -14n -3n = 21 + -21 + -14n Combine like terms: 21 + -21 = 0 -3n = 0 + -14n -3n = -14n Solving -3n = -14n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '14n' to each side of the equation. -3n + 14n = -14n + 14n Combine like terms: -3n + 14n = 11n 11n = -14n + 14n Combine like terms: -14n + 14n = 0 11n = 0 Divide each side by '11'. n = 0 Simplifying n = 0
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